Finding the Fourth Proportional to 12,309.08, 18,438.96 and 5,726.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,309.08 : 18,438.96 = 5,726.12 : x
2. Step 2: Convert to fraction form
   12,309.08/18,438.96 = 5,726.12/x
3. Step 3: Cross multiply
   12,309.08x = 18,438.96 × 5,726.12
4. Step 4: Simplify right side
   12,309.08x = 105,583,697.64
5. Step 5: Solve for x
   x = 105,583,697.64/12,309.08
6. Step 6: Final answer
   x = 8,577.71