Finding the Fourth Proportional to 12,379.12, 18,566.76 and 3,613.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,379.12 : 18,566.76 = 3,613.12 : x
2. Step 2: Convert to fraction form
   12,379.12/18,566.76 = 3,613.12/x
3. Step 3: Cross multiply
   12,379.12x = 18,566.76 × 3,613.12
4. Step 4: Simplify right side
   12,379.12x = 67,083,931.89
5. Step 5: Solve for x
   x = 67,083,931.89/12,379.12
6. Step 6: Final answer
   x = 5,419.12