Finding the Fourth Proportional to 338,123.72, 506,685.18 and 138,202.76

Step by Step Solution

1. Step 1: Write the proportion equation
   338,123.72 : 506,685.18 = 138,202.76 : x
2. Step 2: Convert to fraction form
   338,123.72/506,685.18 = 138,202.76/x
3. Step 3: Cross multiply
   338,123.72x = 506,685.18 × 138,202.76
4. Step 4: Simplify right side
   338,123.72x = 70,025,290,327.10
5. Step 5: Solve for x
   x = 70,025,290,327.10/338,123.72
6. Step 6: Final answer
   x = 207,099.61