Finding the Fourth Proportional to 10,391.50, 15,591.81 and 5,459.99

Step by Step Solution

1. Step 1: Write the proportion equation
   10,391.50 : 15,591.81 = 5,459.99 : x
2. Step 2: Convert to fraction form
   10,391.50/15,591.81 = 5,459.99/x
3. Step 3: Cross multiply
   10,391.50x = 15,591.81 × 5,459.99
4. Step 4: Simplify right side
   10,391.50x = 85,131,126.68
5. Step 5: Solve for x
   x = 85,131,126.68/10,391.50
6. Step 6: Final answer
   x = 8,192.38