Finding the Fourth Proportional to 156,632.78, 216,153.42 and 85,012.82

Step by Step Solution

1. Step 1: Write the proportion equation
   156,632.78 : 216,153.42 = 85,012.82 : x
2. Step 2: Convert to fraction form
   156,632.78/216,153.42 = 85,012.82/x
3. Step 3: Cross multiply
   156,632.78x = 216,153.42 × 85,012.82
4. Step 4: Simplify right side
   156,632.78x = 18,375,810,706.08
5. Step 5: Solve for x
   x = 18,375,810,706.08/156,632.78
6. Step 6: Final answer
   x = 117,317.79