Finding the Fourth Proportional to 209,123.31, 288,591.06 and 113,630.38

Step by Step Solution

1. Step 1: Write the proportion equation
   209,123.31 : 288,591.06 = 113,630.38 : x
2. Step 2: Convert to fraction form
   209,123.31/288,591.06 = 113,630.38/x
3. Step 3: Cross multiply
   209,123.31x = 288,591.06 × 113,630.38
4. Step 4: Simplify right side
   209,123.31x = 32,792,711,812.40
5. Step 5: Solve for x
   x = 32,792,711,812.40/209,123.31
6. Step 6: Final answer
   x = 156,810.41