Finding the Fourth Proportional to 12,391.50, 18,594.81 and 5,370.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,391.50 : 18,594.81 = 5,370.15 : x
2. Step 2: Convert to fraction form
   12,391.50/18,594.81 = 5,370.15/x
3. Step 3: Cross multiply
   12,391.50x = 18,594.81 × 5,370.15
4. Step 4: Simplify right side
   12,391.50x = 99,856,918.92
5. Step 5: Solve for x
   x = 99,856,918.92/12,391.50
6. Step 6: Final answer
   x = 8,058.50