Finding the Fourth Proportional to 139,540.33, 209,047.12 and 82,443.87

Step by Step Solution

1. Step 1: Write the proportion equation
   139,540.33 : 209,047.12 = 82,443.87 : x
2. Step 2: Convert to fraction form
   139,540.33/209,047.12 = 82,443.87/x
3. Step 3: Cross multiply
   139,540.33x = 209,047.12 × 82,443.87
4. Step 4: Simplify right side
   139,540.33x = 17,234,653,585.15
5. Step 5: Solve for x
   x = 17,234,653,585.15/139,540.33
6. Step 6: Final answer
   x = 123,510.20