Finding the Fourth Proportional to 82,129.57, 123,401.95 and 78,808.07

Step by Step Solution

1. Step 1: Write the proportion equation
   82,129.57 : 123,401.95 = 78,808.07 : x
2. Step 2: Convert to fraction form
   82,129.57/123,401.95 = 78,808.07/x
3. Step 3: Cross multiply
   82,129.57x = 123,401.95 × 78,808.07
4. Step 4: Simplify right side
   82,129.57x = 9,725,069,625.22
5. Step 5: Solve for x
   x = 9,725,069,625.22/82,129.57
6. Step 6: Final answer
   x = 118,411.31