Finding the Fourth Proportional to 647,671.50, 971,513.40 and 248,217.30

Step by Step Solution

1. Step 1: Write the proportion equation
   647,671.50 : 971,513.40 = 248,217.30 : x
2. Step 2: Convert to fraction form
   647,671.50/971,513.40 = 248,217.30/x
3. Step 3: Cross multiply
   647,671.50x = 971,513.40 × 248,217.30
4. Step 4: Simplify right side
   647,671.50x = 241,146,433,061.82
5. Step 5: Solve for x
   x = 241,146,433,061.82/647,671.50
6. Step 6: Final answer
   x = 372,328.31