Finding the Fourth Proportional to 12,399.12, 18,606.24 and 5,377.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.12 : 18,606.24 = 5,377.80 : x
2. Step 2: Convert to fraction form
   12,399.12/18,606.24 = 5,377.80/x
3. Step 3: Cross multiply
   12,399.12x = 18,606.24 × 5,377.80
4. Step 4: Simplify right side
   12,399.12x = 100,060,637.47
5. Step 5: Solve for x
   x = 100,060,637.47/12,399.12
6. Step 6: Final answer
   x = 8,069.98