Finding the Fourth Proportional to 116,686.50, 161,028.18 and 66,385.50

Step by Step Solution

1. Step 1: Write the proportion equation
   116,686.50 : 161,028.18 = 66,385.50 : x
2. Step 2: Convert to fraction form
   116,686.50/161,028.18 = 66,385.50/x
3. Step 3: Cross multiply
   116,686.50x = 161,028.18 × 66,385.50
4. Step 4: Simplify right side
   116,686.50x = 10,689,936,243.39
5. Step 5: Solve for x
   x = 10,689,936,243.39/116,686.50
6. Step 6: Final answer
   x = 91,612.45