Finding the Fourth Proportional to 15,499.29, 21,388.55 and 9,126.48

Step by Step Solution

1. Step 1: Write the proportion equation
   15,499.29 : 21,388.55 = 9,126.48 : x
2. Step 2: Convert to fraction form
   15,499.29/21,388.55 = 9,126.48/x
3. Step 3: Cross multiply
   15,499.29x = 21,388.55 × 9,126.48
4. Step 4: Simplify right side
   15,499.29x = 195,202,128.17
5. Step 5: Solve for x
   x = 195,202,128.17/15,499.29
6. Step 6: Final answer
   x = 12,594.26