Finding the Fourth Proportional to 5,287.43, 7,925.42 and 3,439.86

Step by Step Solution

1. Step 1: Write the proportion equation
   5,287.43 : 7,925.42 = 3,439.86 : x
2. Step 2: Convert to fraction form
   5,287.43/7,925.42 = 3,439.86/x
3. Step 3: Cross multiply
   5,287.43x = 7,925.42 × 3,439.86
4. Step 4: Simplify right side
   5,287.43x = 27,262,318.04
5. Step 5: Solve for x
   x = 27,262,318.04/5,287.43
6. Step 6: Final answer
   x = 5,156.07