Finding the Fourth Proportional to 5,431.40, 8,113.72 and 4,337.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,431.40 : 8,113.72 = 4,337.72 : x
2. Step 2: Convert to fraction form
   5,431.40/8,113.72 = 4,337.72/x
3. Step 3: Cross multiply
   5,431.40x = 8,113.72 × 4,337.72
4. Step 4: Simplify right side
   5,431.40x = 35,195,045.52
5. Step 5: Solve for x
   x = 35,195,045.52/5,431.40
6. Step 6: Final answer
   x = 6,479.92