Finding the Fourth Proportional to 8,613.78, 12,918.95 and 2,372.17

Step by Step Solution

1. Step 1: Write the proportion equation
   8,613.78 : 12,918.95 = 2,372.17 : x
2. Step 2: Convert to fraction form
   8,613.78/12,918.95 = 2,372.17/x
3. Step 3: Cross multiply
   8,613.78x = 12,918.95 × 2,372.17
4. Step 4: Simplify right side
   8,613.78x = 30,645,951.55
5. Step 5: Solve for x
   x = 30,645,951.55/8,613.78
6. Step 6: Final answer
   x = 3,557.78