Finding the Fourth Proportional to 10,440.56, 14,407.80 and 5,725.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,440.56 : 14,407.80 = 5,725.28 : x
2. Step 2: Convert to fraction form
   10,440.56/14,407.80 = 5,725.28/x
3. Step 3: Cross multiply
   10,440.56x = 14,407.80 × 5,725.28
4. Step 4: Simplify right side
   10,440.56x = 82,488,689.18
5. Step 5: Solve for x
   x = 82,488,689.18/10,440.56
6. Step 6: Final answer
   x = 7,900.79