Finding the Fourth Proportional to 13,308.71, 18,366.95 and 7,644.38

Step by Step Solution

1. Step 1: Write the proportion equation
   13,308.71 : 18,366.95 = 7,644.38 : x
2. Step 2: Convert to fraction form
   13,308.71/18,366.95 = 7,644.38/x
3. Step 3: Cross multiply
   13,308.71x = 18,366.95 × 7,644.38
4. Step 4: Simplify right side
   13,308.71x = 140,403,872.52
5. Step 5: Solve for x
   x = 140,403,872.52/13,308.71
6. Step 6: Final answer
   x = 10,549.78