Finding the Fourth Proportional to 10,425.57, 14,387.31 and 5,645.57

Step by Step Solution

1. Step 1: Write the proportion equation
   10,425.57 : 14,387.31 = 5,645.57 : x
2. Step 2: Convert to fraction form
   10,425.57/14,387.31 = 5,645.57/x
3. Step 3: Cross multiply
   10,425.57x = 14,387.31 × 5,645.57
4. Step 4: Simplify right side
   10,425.57x = 81,224,493.78
5. Step 5: Solve for x
   x = 81,224,493.78/10,425.57
6. Step 6: Final answer
   x = 7,790.89