Finding the Fourth Proportional to 131,308.79, 196,647.47 and 74,978.20

Step by Step Solution

1. Step 1: Write the proportion equation
   131,308.79 : 196,647.47 = 74,978.20 : x
2. Step 2: Convert to fraction form
   131,308.79/196,647.47 = 74,978.20/x
3. Step 3: Cross multiply
   131,308.79x = 196,647.47 × 74,978.20
4. Step 4: Simplify right side
   131,308.79x = 14,744,273,335.15
5. Step 5: Solve for x
   x = 14,744,273,335.15/131,308.79
6. Step 6: Final answer
   x = 112,287.02