Finding the Fourth Proportional to 12,399.50, 17,111.32 and 6,810.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.50 : 17,111.32 = 6,810.86 : x
2. Step 2: Convert to fraction form
   12,399.50/17,111.32 = 6,810.86/x
3. Step 3: Cross multiply
   12,399.50x = 17,111.32 × 6,810.86
4. Step 4: Simplify right side
   12,399.50x = 116,542,804.94
5. Step 5: Solve for x
   x = 116,542,804.94/12,399.50
6. Step 6: Final answer
   x = 9,398.99