Finding the Fourth Proportional to 10,900.24, 15,042.72 and 8,538.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,900.24 : 15,042.72 = 8,538.28 : x
2. Step 2: Convert to fraction form
   10,900.24/15,042.72 = 8,538.28/x
3. Step 3: Cross multiply
   10,900.24x = 15,042.72 × 8,538.28
4. Step 4: Simplify right side
   10,900.24x = 128,438,955.32
5. Step 5: Solve for x
   x = 128,438,955.32/10,900.24
6. Step 6: Final answer
   x = 11,783.13