Finding the Fourth Proportional to 139,537.33, 209,042.62 and 82,440.87

Step by Step Solution

1. Step 1: Write the proportion equation
   139,537.33 : 209,042.62 = 82,440.87 : x
2. Step 2: Convert to fraction form
   139,537.33/209,042.62 = 82,440.87/x
3. Step 3: Cross multiply
   139,537.33x = 209,042.62 × 82,440.87
4. Step 4: Simplify right side
   139,537.33x = 17,233,655,645.73
5. Step 5: Solve for x
   x = 17,233,655,645.73/139,537.33
6. Step 6: Final answer
   x = 123,505.70