Finding the Fourth Proportional to 13,929.19, 19,222.59 and 7,641.57

Step by Step Solution

1. Step 1: Write the proportion equation
   13,929.19 : 19,222.59 = 7,641.57 : x
2. Step 2: Convert to fraction form
   13,929.19/19,222.59 = 7,641.57/x
3. Step 3: Cross multiply
   13,929.19x = 19,222.59 × 7,641.57
4. Step 4: Simplify right side
   13,929.19x = 146,890,767.07
5. Step 5: Solve for x
   x = 146,890,767.07/13,929.19
6. Step 6: Final answer
   x = 10,545.54