Finding the Fourth Proportional to 11,326.39, 15,612.25 and 7,691.30

Step by Step Solution

1. Step 1: Write the proportion equation
   11,326.39 : 15,612.25 = 7,691.30 : x
2. Step 2: Convert to fraction form
   11,326.39/15,612.25 = 7,691.30/x
3. Step 3: Cross multiply
   11,326.39x = 15,612.25 × 7,691.30
4. Step 4: Simplify right side
   11,326.39x = 120,078,440.17
5. Step 5: Solve for x
   x = 120,078,440.17/11,326.39
6. Step 6: Final answer
   x = 10,601.65