Finding the Fourth Proportional to 11,326.64, 15,612.59 and 7,691.55

Step by Step Solution

1. Step 1: Write the proportion equation
   11,326.64 : 15,612.59 = 7,691.55 : x
2. Step 2: Convert to fraction form
   11,326.64/15,612.59 = 7,691.55/x
3. Step 3: Cross multiply
   11,326.64x = 15,612.59 × 7,691.55
4. Step 4: Simplify right side
   11,326.64x = 120,084,996.81
5. Step 5: Solve for x
   x = 120,084,996.81/11,326.64
6. Step 6: Final answer
   x = 10,601.99