Finding the Fourth Proportional to 80,843.75, 121,158.15 and 42,885.20

Step by Step Solution

1. Step 1: Write the proportion equation
   80,843.75 : 121,158.15 = 42,885.20 : x
2. Step 2: Convert to fraction form
   80,843.75/121,158.15 = 42,885.20/x
3. Step 3: Cross multiply
   80,843.75x = 121,158.15 × 42,885.20
4. Step 4: Simplify right side
   80,843.75x = 5,195,890,888.59
5. Step 5: Solve for x
   x = 5,195,890,888.59/80,843.75
6. Step 6: Final answer
   x = 64,270.78