Finding the Fourth Proportional to 5,085.60, 7,007.12 and 4,087.20

Step by Step Solution

1. Step 1: Write the proportion equation
   5,085.60 : 7,007.12 = 4,087.20 : x
2. Step 2: Convert to fraction form
   5,085.60/7,007.12 = 4,087.20/x
3. Step 3: Cross multiply
   5,085.60x = 7,007.12 × 4,087.20
4. Step 4: Simplify right side
   5,085.60x = 28,639,500.86
5. Step 5: Solve for x
   x = 28,639,500.86/5,085.60
6. Step 6: Final answer
   x = 5,631.49