Finding the Fourth Proportional to 5,412.20, 7,470.97 and 4,085.42

Step by Step Solution

1. Step 1: Write the proportion equation
   5,412.20 : 7,470.97 = 4,085.42 : x
2. Step 2: Convert to fraction form
   5,412.20/7,470.97 = 4,085.42/x
3. Step 3: Cross multiply
   5,412.20x = 7,470.97 × 4,085.42
4. Step 4: Simplify right side
   5,412.20x = 30,522,002.69
5. Step 5: Solve for x
   x = 30,522,002.69/5,412.20
6. Step 6: Final answer
   x = 5,639.49