Finding the Fourth Proportional to 65,187.12, 89,959.50 and 42,540.60

Step by Step Solution

1. Step 1: Write the proportion equation
   65,187.12 : 89,959.50 = 42,540.60 : x
2. Step 2: Convert to fraction form
   65,187.12/89,959.50 = 42,540.60/x
3. Step 3: Cross multiply
   65,187.12x = 89,959.50 × 42,540.60
4. Step 4: Simplify right side
   65,187.12x = 3,826,931,105.70
5. Step 5: Solve for x
   x = 3,826,931,105.70/65,187.12
6. Step 6: Final answer
   x = 58,706.86