Finding the Fourth Proportional to 86,516.10, 129,968.55 and 83,211.30

Step by Step Solution

1. Step 1: Write the proportion equation
   86,516.10 : 129,968.55 = 83,211.30 : x
2. Step 2: Convert to fraction form
   86,516.10/129,968.55 = 83,211.30/x
3. Step 3: Cross multiply
   86,516.10x = 129,968.55 × 83,211.30
4. Step 4: Simplify right side
   86,516.10x = 10,814,852,004.62
5. Step 5: Solve for x
   x = 10,814,852,004.62/86,516.10
6. Step 6: Final answer
   x = 125,003.92