Finding the Fourth Proportional to 156,978.06, 216,632.43 and 85,358.55

Step by Step Solution

1. Step 1: Write the proportion equation
   156,978.06 : 216,632.43 = 85,358.55 : x
2. Step 2: Convert to fraction form
   156,978.06/216,632.43 = 85,358.55/x
3. Step 3: Cross multiply
   156,978.06x = 216,632.43 × 85,358.55
4. Step 4: Simplify right side
   156,978.06x = 18,491,430,107.78
5. Step 5: Solve for x
   x = 18,491,430,107.78/156,978.06
6. Step 6: Final answer
   x = 117,796.27