Finding the Fourth Proportional to 9,689.64, 13,371.72 and 5,440.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,689.64 : 13,371.72 = 5,440.80 : x
2. Step 2: Convert to fraction form
   9,689.64/13,371.72 = 5,440.80/x
3. Step 3: Cross multiply
   9,689.64x = 13,371.72 × 5,440.80
4. Step 4: Simplify right side
   9,689.64x = 72,752,854.18
5. Step 5: Solve for x
   x = 72,752,854.18/9,689.64
6. Step 6: Final answer
   x = 7,508.31