Finding the Fourth Proportional to 10,089.12, 15,111.12 and 7,158.48

Step by Step Solution

1. Step 1: Write the proportion equation
   10,089.12 : 15,111.12 = 7,158.48 : x
2. Step 2: Convert to fraction form
   10,089.12/15,111.12 = 7,158.48/x
3. Step 3: Cross multiply
   10,089.12x = 15,111.12 × 7,158.48
4. Step 4: Simplify right side
   10,089.12x = 108,172,650.30
5. Step 5: Solve for x
   x = 108,172,650.30/10,089.12
6. Step 6: Final answer
   x = 10,721.71