Finding the Fourth Proportional to 5,687.39, 7,845.60 and 3,915.92

Step by Step Solution

1. Step 1: Write the proportion equation
   5,687.39 : 7,845.60 = 3,915.92 : x
2. Step 2: Convert to fraction form
   5,687.39/7,845.60 = 3,915.92/x
3. Step 3: Cross multiply
   5,687.39x = 7,845.60 × 3,915.92
4. Step 4: Simplify right side
   5,687.39x = 30,722,741.95
5. Step 5: Solve for x
   x = 30,722,741.95/5,687.39
6. Step 6: Final answer
   x = 5,401.91