Finding the Fourth Proportional to 116,875.84, 161,256 and 78,689.20

Step by Step Solution

1. Step 1: Write the proportion equation
   116,875.84 : 161,256 = 78,689.20 : x
2. Step 2: Convert to fraction form
   116,875.84/161,256 = 78,689.20/x
3. Step 3: Cross multiply
   116,875.84x = 161,256 × 78,689.20
4. Step 4: Simplify right side
   116,875.84x = 12,689,105,635.20
5. Step 5: Solve for x
   x = 12,689,105,635.20/116,875.84
6. Step 6: Final answer
   x = 108,569.11