Finding the Fourth Proportional to 12,443.40, 18,639.12 and 5,522.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,443.40 : 18,639.12 = 5,522.76 : x
2. Step 2: Convert to fraction form
   12,443.40/18,639.12 = 5,522.76/x
3. Step 3: Cross multiply
   12,443.40x = 18,639.12 × 5,522.76
4. Step 4: Simplify right side
   12,443.40x = 102,939,386.37
5. Step 5: Solve for x
   x = 102,939,386.37/12,443.40
6. Step 6: Final answer
   x = 8,272.61