Finding the Fourth Proportional to 156,636.27, 216,158.05 and 85,016.31

Step by Step Solution

1. Step 1: Write the proportion equation
   156,636.27 : 216,158.05 = 85,016.31 : x
2. Step 2: Convert to fraction form
   156,636.27/216,158.05 = 85,016.31/x
3. Step 3: Cross multiply
   156,636.27x = 216,158.05 × 85,016.31
4. Step 4: Simplify right side
   156,636.27x = 18,376,959,787.80
5. Step 5: Solve for x
   x = 18,376,959,787.80/156,636.27
6. Step 6: Final answer
   x = 117,322.51