Finding the Fourth Proportional to 10,981.49, 16,451.60 and 5,428.37

Step by Step Solution

1. Step 1: Write the proportion equation
   10,981.49 : 16,451.60 = 5,428.37 : x
2. Step 2: Convert to fraction form
   10,981.49/16,451.60 = 5,428.37/x
3. Step 3: Cross multiply
   10,981.49x = 16,451.60 × 5,428.37
4. Step 4: Simplify right side
   10,981.49x = 89,305,344.75
5. Step 5: Solve for x
   x = 89,305,344.75/10,981.49
6. Step 6: Final answer
   x = 8,132.35