Finding the Fourth Proportional to 521,105.30, 781,701.15 and 166,109.30

Step by Step Solution

1. Step 1: Write the proportion equation
   521,105.30 : 781,701.15 = 166,109.30 : x
2. Step 2: Convert to fraction form
   521,105.30/781,701.15 = 166,109.30/x
3. Step 3: Cross multiply
   521,105.30x = 781,701.15 × 166,109.30
4. Step 4: Simplify right side
   521,105.30x = 129,847,830,835.70
5. Step 5: Solve for x
   x = 129,847,830,835.70/521,105.30
6. Step 6: Final answer
   x = 249,177.72