Finding the Fourth Proportional to 10,974.24, 16,440.72 and 5,421.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,974.24 : 16,440.72 = 5,421.12 : x
2. Step 2: Convert to fraction form
   10,974.24/16,440.72 = 5,421.12/x
3. Step 3: Cross multiply
   10,974.24x = 16,440.72 × 5,421.12
4. Step 4: Simplify right side
   10,974.24x = 89,127,116.01
5. Step 5: Solve for x
   x = 89,127,116.01/10,974.24
6. Step 6: Final answer
   x = 8,121.48