Finding the Fourth Proportional to 10,614.28, 15,928.70 and 5,423.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,614.28 : 15,928.70 = 5,423.72 : x
2. Step 2: Convert to fraction form
   10,614.28/15,928.70 = 5,423.72/x
3. Step 3: Cross multiply
   10,614.28x = 15,928.70 × 5,423.72
4. Step 4: Simplify right side
   10,614.28x = 86,392,808.76
5. Step 5: Solve for x
   x = 86,392,808.76/10,614.28
6. Step 6: Final answer
   x = 8,139.30