Finding the Fourth Proportional to 57,392.28, 79,179.12 and 42,320.70

Step by Step Solution

1. Step 1: Write the proportion equation
   57,392.28 : 79,179.12 = 42,320.70 : x
2. Step 2: Convert to fraction form
   57,392.28/79,179.12 = 42,320.70/x
3. Step 3: Cross multiply
   57,392.28x = 79,179.12 × 42,320.70
4. Step 4: Simplify right side
   57,392.28x = 3,350,915,783.78
5. Step 5: Solve for x
   x = 3,350,915,783.78/57,392.28
6. Step 6: Final answer
   x = 58,386.18