Finding the Fourth Proportional to 12,633.72, 18,958.78 and 5,708.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,633.72 : 18,958.78 = 5,708.28 : x
2. Step 2: Convert to fraction form
   12,633.72/18,958.78 = 5,708.28/x
3. Step 3: Cross multiply
   12,633.72x = 18,958.78 × 5,708.28
4. Step 4: Simplify right side
   12,633.72x = 108,222,024.70
5. Step 5: Solve for x
   x = 108,222,024.70/12,633.72
6. Step 6: Final answer
   x = 8,566.12