Finding the Fourth Proportional to 13,929.63, 19,222.83 and 7,641.87

Step by Step Solution

1. Step 1: Write the proportion equation
   13,929.63 : 19,222.83 = 7,641.87 : x
2. Step 2: Convert to fraction form
   13,929.63/19,222.83 = 7,641.87/x
3. Step 3: Cross multiply
   13,929.63x = 19,222.83 × 7,641.87
4. Step 4: Simplify right side
   13,929.63x = 146,898,367.89
5. Step 5: Solve for x
   x = 146,898,367.89/13,929.63
6. Step 6: Final answer
   x = 10,545.75