Finding the Fourth Proportional to 12,613.74, 18,933.57 and 12,147.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,613.74 : 18,933.57 = 12,147.18 : x
2. Step 2: Convert to fraction form
   12,613.74/18,933.57 = 12,147.18/x
3. Step 3: Cross multiply
   12,613.74x = 18,933.57 × 12,147.18
4. Step 4: Simplify right side
   12,613.74x = 229,989,482.83
5. Step 5: Solve for x
   x = 229,989,482.83/12,613.74
6. Step 6: Final answer
   x = 18,233.25