Finding the Fourth Proportional to 521,107.30, 781,704.15 and 166,111.30

Step by Step Solution

1. Step 1: Write the proportion equation
   521,107.30 : 781,704.15 = 166,111.30 : x
2. Step 2: Convert to fraction form
   521,107.30/781,704.15 = 166,111.30/x
3. Step 3: Cross multiply
   521,107.30x = 781,704.15 × 166,111.30
4. Step 4: Simplify right side
   521,107.30x = 129,849,892,571.90
5. Step 5: Solve for x
   x = 129,849,892,571.90/521,107.30
6. Step 6: Final answer
   x = 249,180.72