Finding the Fourth Proportional to 12,302.76, 18,439.72 and 5,715.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,302.76 : 18,439.72 = 5,715.08 : x
2. Step 2: Convert to fraction form
   12,302.76/18,439.72 = 5,715.08/x
3. Step 3: Cross multiply
   12,302.76x = 18,439.72 × 5,715.08
4. Step 4: Simplify right side
   12,302.76x = 105,384,474.98
5. Step 5: Solve for x
   x = 105,384,474.98/12,302.76
6. Step 6: Final answer
   x = 8,565.92