Finding the Fourth Proportional to 11,308.16, 15,587.28 and 8,914.25

Step by Step Solution

1. Step 1: Write the proportion equation
   11,308.16 : 15,587.28 = 8,914.25 : x
2. Step 2: Convert to fraction form
   11,308.16/15,587.28 = 8,914.25/x
3. Step 3: Cross multiply
   11,308.16x = 15,587.28 × 8,914.25
4. Step 4: Simplify right side
   11,308.16x = 138,948,949.71
5. Step 5: Solve for x
   x = 138,948,949.71/11,308.16
6. Step 6: Final answer
   x = 12,287.49