Finding the Fourth Proportional to 10,872.54, 14,987.88 and 7,509.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,872.54 : 14,987.88 = 7,509.78 : x
2. Step 2: Convert to fraction form
   10,872.54/14,987.88 = 7,509.78/x
3. Step 3: Cross multiply
   10,872.54x = 14,987.88 × 7,509.78
4. Step 4: Simplify right side
   10,872.54x = 112,555,681.47
5. Step 5: Solve for x
   x = 112,555,681.47/10,872.54
6. Step 6: Final answer
   x = 10,352.29