Finding the Fourth Proportional to 131,422.10, 196,679.55 and 78,869.30

Step by Step Solution

1. Step 1: Write the proportion equation
   131,422.10 : 196,679.55 = 78,869.30 : x
2. Step 2: Convert to fraction form
   131,422.10/196,679.55 = 78,869.30/x
3. Step 3: Cross multiply
   131,422.10x = 196,679.55 × 78,869.30
4. Step 4: Simplify right side
   131,422.10x = 15,511,978,432.82
5. Step 5: Solve for x
   x = 15,511,978,432.82/131,422.10
6. Step 6: Final answer
   x = 118,031.73