Here are the answers to your challenging place value problems:

1. Place value of the digit 3 in the number 4,305,682:
   The digit 3 is in the hundred-thousands place, so its place value is 300,000.

2. Expanded form of 76,904,150:
   $70,000,000 + 6,000,000 + 900,000 + 4,000 + 100 + 50$

3. Value of the digit 0 in the number 7,029,458:
   The value of the digit 0 is 0 because it doesn't contribute to the value of the number.

4. Round the number 548,726 to the nearest ten thousand:
   The number rounded to the nearest ten thousand is 550,000.

5. Digit in the hundred-millions place in the number 932,608,415:
   The digit in the hundred-millions place is 9.

Would you like more details on any of these answers?

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Here are 5 more advanced questions for practice:

1. What is the place value of the digit 6 in the number 86,721,904?
2. Write the number 405,020,007 in expanded form.
3. In the number 3,204,108, what is the value of the digit 2?
4. Round the number 9,135,872 to the nearest hundred thousand.
5. What digit is in the ten-millions place in the number 560,987,324?

Tip: To master place value, practice decomposing large numbers into their individual place values regularly.