Finding the Fourth Proportional to 10,108.40, 15,167.86 and 7,642.49

Step by Step Solution

1. Step 1: Write the proportion equation
   10,108.40 : 15,167.86 = 7,642.49 : x
2. Step 2: Convert to fraction form
   10,108.40/15,167.86 = 7,642.49/x
3. Step 3: Cross multiply
   10,108.40x = 15,167.86 × 7,642.49
4. Step 4: Simplify right side
   10,108.40x = 115,920,123.43
5. Step 5: Solve for x
   x = 115,920,123.43/10,108.40
6. Step 6: Final answer
   x = 11,467.71