Finding the Fourth Proportional to 12,418.56, 18,618.54 and 7,487.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,418.56 : 18,618.54 = 7,487.04 : x
2. Step 2: Convert to fraction form
   12,418.56/18,618.54 = 7,487.04/x
3. Step 3: Cross multiply
   12,418.56x = 18,618.54 × 7,487.04
4. Step 4: Simplify right side
   12,418.56x = 139,397,753.72
5. Step 5: Solve for x
   x = 139,397,753.72/12,418.56
6. Step 6: Final answer
   x = 11,224.95