Finding the Fourth Proportional to 116,940.13, 161,451.17 and 81,117.61

Step by Step Solution

1. Step 1: Write the proportion equation
   116,940.13 : 161,451.17 = 81,117.61 : x
2. Step 2: Convert to fraction form
   116,940.13/161,451.17 = 81,117.61/x
3. Step 3: Cross multiply
   116,940.13x = 161,451.17 × 81,117.61
4. Step 4: Simplify right side
   116,940.13x = 13,096,533,042.10
5. Step 5: Solve for x
   x = 13,096,533,042.10/116,940.13
6. Step 6: Final answer
   x = 111,993.49