Finding the Fourth Proportional to 79,086.47, 109,139.04 and 42,787.80

Step by Step Solution

1. Step 1: Write the proportion equation
   79,086.47 : 109,139.04 = 42,787.80 : x
2. Step 2: Convert to fraction form
   79,086.47/109,139.04 = 42,787.80/x
3. Step 3: Cross multiply
   79,086.47x = 109,139.04 × 42,787.80
4. Step 4: Simplify right side
   79,086.47x = 4,669,819,391.68
5. Step 5: Solve for x
   x = 4,669,819,391.68/79,086.47
6. Step 6: Final answer
   x = 59,047.01