Finding the Fourth Proportional to 10,426.75, 14,388.92 and 5,711.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,426.75 : 14,388.92 = 5,711.20 : x
2. Step 2: Convert to fraction form
   10,426.75/14,388.92 = 5,711.20/x
3. Step 3: Cross multiply
   10,426.75x = 14,388.92 × 5,711.20
4. Step 4: Simplify right side
   10,426.75x = 82,177,999.90
5. Step 5: Solve for x
   x = 82,177,999.90/10,426.75
6. Step 6: Final answer
   x = 7,881.46