Finding the Fourth Proportional to 13,929.16, 19,222.74 and 7,641.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,929.16 : 19,222.74 = 7,641.72 : x
2. Step 2: Convert to fraction form
   13,929.16/19,222.74 = 7,641.72/x
3. Step 3: Cross multiply
   13,929.16x = 19,222.74 × 7,641.72
4. Step 4: Simplify right side
   13,929.16x = 146,894,796.71
5. Step 5: Solve for x
   x = 146,894,796.71/13,929.16
6. Step 6: Final answer
   x = 10,545.85