Finding the Fourth Proportional to 12,390.50, 18,593.31 and 5,369.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,390.50 : 18,593.31 = 5,369.15 : x
2. Step 2: Convert to fraction form
   12,390.50/18,593.31 = 5,369.15/x
3. Step 3: Cross multiply
   12,390.50x = 18,593.31 × 5,369.15
4. Step 4: Simplify right side
   12,390.50x = 99,830,177.42
5. Step 5: Solve for x
   x = 99,830,177.42/12,390.50
6. Step 6: Final answer
   x = 8,057.00