Finding the Fourth Proportional to 12,399.02, 18,683.76 and 10,255.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.02 : 18,683.76 = 10,255.76 : x
2. Step 2: Convert to fraction form
   12,399.02/18,683.76 = 10,255.76/x
3. Step 3: Cross multiply
   12,399.02x = 18,683.76 × 10,255.76
4. Step 4: Simplify right side
   12,399.02x = 191,616,173.56
5. Step 5: Solve for x
   x = 191,616,173.56/12,399.02
6. Step 6: Final answer
   x = 15,454.14