Finding the Fourth Proportional to 82,131.57, 123,404.95 and 78,810.07

Step by Step Solution

1. Step 1: Write the proportion equation
   82,131.57 : 123,404.95 = 78,810.07 : x
2. Step 2: Convert to fraction form
   82,131.57/123,404.95 = 78,810.07/x
3. Step 3: Cross multiply
   82,131.57x = 123,404.95 × 78,810.07
4. Step 4: Simplify right side
   82,131.57x = 9,725,552,747.85
5. Step 5: Solve for x
   x = 9,725,552,747.85/82,131.57
6. Step 6: Final answer
   x = 118,414.30