Finding the Fourth Proportional to 10,385.50, 15,582.81 and 5,453.99

Step by Step Solution

1. Step 1: Write the proportion equation
   10,385.50 : 15,582.81 = 5,453.99 : x
2. Step 2: Convert to fraction form
   10,385.50/15,582.81 = 5,453.99/x
3. Step 3: Cross multiply
   10,385.50x = 15,582.81 × 5,453.99
4. Step 4: Simplify right side
   10,385.50x = 84,988,489.91
5. Step 5: Solve for x
   x = 84,988,489.91/10,385.50
6. Step 6: Final answer
   x = 8,183.38