Finding the Fourth Proportional to 86,059.72, 129,126.06 and 79,170.76

Step by Step Solution

1. Step 1: Write the proportion equation
   86,059.72 : 129,126.06 = 79,170.76 : x
2. Step 2: Convert to fraction form
   86,059.72/129,126.06 = 79,170.76/x
3. Step 3: Cross multiply
   86,059.72x = 129,126.06 × 79,170.76
4. Step 4: Simplify right side
   86,059.72x = 10,223,008,306.01
5. Step 5: Solve for x
   x = 10,223,008,306.01/86,059.72
6. Step 6: Final answer
   x = 118,789.70