Finding the Fourth Proportional to 10,550.52, 15,802.56 and 9,128.16

Step by Step Solution

1. Step 1: Write the proportion equation
   10,550.52 : 15,802.56 = 9,128.16 : x
2. Step 2: Convert to fraction form
   10,550.52/15,802.56 = 9,128.16/x
3. Step 3: Cross multiply
   10,550.52x = 15,802.56 × 9,128.16
4. Step 4: Simplify right side
   10,550.52x = 144,248,296.09
5. Step 5: Solve for x
   x = 144,248,296.09/10,550.52
6. Step 6: Final answer
   x = 13,672.15