Finding the Fourth Proportional to 78,591.28, 108,455.34 and 42,781.18

Step by Step Solution

1. Step 1: Write the proportion equation
   78,591.28 : 108,455.34 = 42,781.18 : x
2. Step 2: Convert to fraction form
   78,591.28/108,455.34 = 42,781.18/x
3. Step 3: Cross multiply
   78,591.28x = 108,455.34 × 42,781.18
4. Step 4: Simplify right side
   78,591.28x = 4,639,847,422.50
5. Step 5: Solve for x
   x = 4,639,847,422.50/78,591.28
6. Step 6: Final answer
   x = 59,037.69