Finding the Fourth Proportional to 156,636.71, 216,158.82 and 85,016.75

Step by Step Solution

1. Step 1: Write the proportion equation
   156,636.71 : 216,158.82 = 85,016.75 : x
2. Step 2: Convert to fraction form
   156,636.71/216,158.82 = 85,016.75/x
3. Step 3: Cross multiply
   156,636.71x = 216,158.82 × 85,016.75
4. Step 4: Simplify right side
   156,636.71x = 18,377,119,066.90
5. Step 5: Solve for x
   x = 18,377,119,066.90/156,636.71
6. Step 6: Final answer
   x = 117,323.20