Finding the Fourth Proportional to 12,813, 19,222.34 and 3,929.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,813 : 19,222.34 = 3,929.57 : x
2. Step 2: Convert to fraction form
   12,813/19,222.34 = 3,929.57/x
3. Step 3: Cross multiply
   12,813x = 19,222.34 × 3,929.57
4. Step 4: Simplify right side
   12,813x = 75,535,414.83
5. Step 5: Solve for x
   x = 75,535,414.83/12,813
6. Step 6: Final answer
   x = 5,895.22