Finding the Fourth Proportional to 13,399.17, 19,980.69 and 12,464.16

Step by Step Solution

1. Step 1: Write the proportion equation
   13,399.17 : 19,980.69 = 12,464.16 : x
2. Step 2: Convert to fraction form
   13,399.17/19,980.69 = 12,464.16/x
3. Step 3: Cross multiply
   13,399.17x = 19,980.69 × 12,464.16
4. Step 4: Simplify right side
   13,399.17x = 249,042,517.07
5. Step 5: Solve for x
   x = 249,042,517.07/13,399.17
6. Step 6: Final answer
   x = 18,586.41