Finding the Fourth Proportional to 12,443.47, 18,658.73 and 3,677.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,443.47 : 18,658.73 = 3,677.20 : x
2. Step 2: Convert to fraction form
   12,443.47/18,658.73 = 3,677.20/x
3. Step 3: Cross multiply
   12,443.47x = 18,658.73 × 3,677.20
4. Step 4: Simplify right side
   12,443.47x = 68,611,863.57
5. Step 5: Solve for x
   x = 68,611,863.57/12,443.47
6. Step 6: Final answer
   x = 5,513.89