Finding the Fourth Proportional to 12,478.72, 18,718.20 and 3,244.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,478.72 : 18,718.20 = 3,244.72 : x
2. Step 2: Convert to fraction form
   12,478.72/18,718.20 = 3,244.72/x
3. Step 3: Cross multiply
   12,478.72x = 18,718.20 × 3,244.72
4. Step 4: Simplify right side
   12,478.72x = 60,735,317.90
5. Step 5: Solve for x
   x = 60,735,317.90/12,478.72
6. Step 6: Final answer
   x = 4,867.11