Finding the Fourth Proportional to 12,742.88, 19,118.88 and 5,722.24

Step by Step Solution

1. Step 1: Write the proportion equation
   12,742.88 : 19,118.88 = 5,722.24 : x
2. Step 2: Convert to fraction form
   12,742.88/19,118.88 = 5,722.24/x
3. Step 3: Cross multiply
   12,742.88x = 19,118.88 × 5,722.24
4. Step 4: Simplify right side
   12,742.88x = 109,402,819.89
5. Step 5: Solve for x
   x = 109,402,819.89/12,742.88
6. Step 6: Final answer
   x = 8,585.41