Finding the Fourth Proportional to 10,981.24, 16,451.22 and 5,428.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,981.24 : 16,451.22 = 5,428.12 : x
2. Step 2: Convert to fraction form
   10,981.24/16,451.22 = 5,428.12/x
3. Step 3: Cross multiply
   10,981.24x = 16,451.22 × 5,428.12
4. Step 4: Simplify right side
   10,981.24x = 89,299,196.31
5. Step 5: Solve for x
   x = 89,299,196.31/10,981.24
6. Step 6: Final answer
   x = 8,131.98