Finding the Fourth Proportional to 156,705.33, 216,250.10 and 85,085.42

Step by Step Solution

1. Step 1: Write the proportion equation
   156,705.33 : 216,250.10 = 85,085.42 : x
2. Step 2: Convert to fraction form
   156,705.33/216,250.10 = 85,085.42/x
3. Step 3: Cross multiply
   156,705.33x = 216,250.10 × 85,085.42
4. Step 4: Simplify right side
   156,705.33x = 18,399,729,076.86
5. Step 5: Solve for x
   x = 18,399,729,076.86/156,705.33
6. Step 6: Final answer
   x = 117,416.10