Finding the Fourth Proportional to 162,123.72, 242,687.31 and 138,208.92

Step by Step Solution

1. Step 1: Write the proportion equation
   162,123.72 : 242,687.31 = 138,208.92 : x
2. Step 2: Convert to fraction form
   162,123.72/242,687.31 = 138,208.92/x
3. Step 3: Cross multiply
   162,123.72x = 242,687.31 × 138,208.92
4. Step 4: Simplify right side
   162,123.72x = 33,541,551,012.81
5. Step 5: Solve for x
   x = 33,541,551,012.81/162,123.72
6. Step 6: Final answer
   x = 206,888.61