Finding the Fourth Proportional to 82,132.57, 123,406.45 and 78,811.07

Step by Step Solution

1. Step 1: Write the proportion equation
   82,132.57 : 123,406.45 = 78,811.07 : x
2. Step 2: Convert to fraction form
   82,132.57/123,406.45 = 78,811.07/x
3. Step 3: Cross multiply
   82,132.57x = 123,406.45 × 78,811.07
4. Step 4: Simplify right side
   82,132.57x = 9,725,794,480.89
5. Step 5: Solve for x
   x = 9,725,794,480.89/82,132.57
6. Step 6: Final answer
   x = 118,415.81