Finding the Fourth Proportional to 116,686.32, 161,025.72 and 66,385.20

Step by Step Solution

1. Step 1: Write the proportion equation
   116,686.32 : 161,025.72 = 66,385.20 : x
2. Step 2: Convert to fraction form
   116,686.32/161,025.72 = 66,385.20/x
3. Step 3: Cross multiply
   116,686.32x = 161,025.72 × 66,385.20
4. Step 4: Simplify right side
   116,686.32x = 10,689,724,627.34
5. Step 5: Solve for x
   x = 10,689,724,627.34/116,686.32
6. Step 6: Final answer
   x = 91,610.78