Finding the Fourth Proportional to 67,520.80, 101,200.20 and 28,057.60

Step by Step Solution

1. Step 1: Write the proportion equation
   67,520.80 : 101,200.20 = 28,057.60 : x
2. Step 2: Convert to fraction form
   67,520.80/101,200.20 = 28,057.60/x
3. Step 3: Cross multiply
   67,520.80x = 101,200.20 × 28,057.60
4. Step 4: Simplify right side
   67,520.80x = 2,839,434,731.52
5. Step 5: Solve for x
   x = 2,839,434,731.52/67,520.80
6. Step 6: Final answer
   x = 42,052.74