Finding the Fourth Proportional to 13,929.32, 19,222.43 and 7,641.68

Step by Step Solution

1. Step 1: Write the proportion equation
   13,929.32 : 19,222.43 = 7,641.68 : x
2. Step 2: Convert to fraction form
   13,929.32/19,222.43 = 7,641.68/x
3. Step 3: Cross multiply
   13,929.32x = 19,222.43 × 7,641.68
4. Step 4: Simplify right side
   13,929.32x = 146,891,658.88
5. Step 5: Solve for x
   x = 146,891,658.88/13,929.32
6. Step 6: Final answer
   x = 10,545.50