Finding the Fourth Proportional to 12,613.80, 17,408.72 and 7,238.36

Step by Step Solution

1. Step 1: Write the proportion equation
   12,613.80 : 17,408.72 = 7,238.36 : x
2. Step 2: Convert to fraction form
   12,613.80/17,408.72 = 7,238.36/x
3. Step 3: Cross multiply
   12,613.80x = 17,408.72 × 7,238.36
4. Step 4: Simplify right side
   12,613.80x = 126,010,582.50
5. Step 5: Solve for x
   x = 126,010,582.50/12,613.80
6. Step 6: Final answer
   x = 9,989.90