Finding the Fourth Proportional to 10,851.47, 16,358.55 and 10,128.14

Step by Step Solution

1. Step 1: Write the proportion equation
   10,851.47 : 16,358.55 = 10,128.14 : x
2. Step 2: Convert to fraction form
   10,851.47/16,358.55 = 10,128.14/x
3. Step 3: Cross multiply
   10,851.47x = 16,358.55 × 10,128.14
4. Step 4: Simplify right side
   10,851.47x = 165,681,626.17
5. Step 5: Solve for x
   x = 165,681,626.17/10,851.47
6. Step 6: Final answer
   x = 15,268.12