Finding the Fourth Proportional to 20,849.43, 31,280.00 and 8,378.22

Step by Step Solution

1. Step 1: Write the proportion equation
   20,849.43 : 31,280.00 = 8,378.22 : x
2. Step 2: Convert to fraction form
   20,849.43/31,280.00 = 8,378.22/x
3. Step 3: Cross multiply
   20,849.43x = 31,280.00 × 8,378.22
4. Step 4: Simplify right side
   20,849.43x = 262,070,679.71
5. Step 5: Solve for x
   x = 262,070,679.71/20,849.43
6. Step 6: Final answer
   x = 12,569.68