Finding the Fourth Proportional to 80,124.12, 120,258.78 and 42,715.56

Step by Step Solution

1. Step 1: Write the proportion equation
   80,124.12 : 120,258.78 = 42,715.56 : x
2. Step 2: Convert to fraction form
   80,124.12/120,258.78 = 42,715.56/x
3. Step 3: Cross multiply
   80,124.12x = 120,258.78 × 42,715.56
4. Step 4: Simplify right side
   80,124.12x = 5,136,921,132.62
5. Step 5: Solve for x
   x = 5,136,921,132.62/80,124.12
6. Step 6: Final answer
   x = 64,112.04