Finding the Fourth Proportional to 13,380.32, 18,443.31 and 9,072.01

Step by Step Solution

1. Step 1: Write the proportion equation
   13,380.32 : 18,443.31 = 9,072.01 : x
2. Step 2: Convert to fraction form
   13,380.32/18,443.31 = 9,072.01/x
3. Step 3: Cross multiply
   13,380.32x = 18,443.31 × 9,072.01
4. Step 4: Simplify right side
   13,380.32x = 167,317,949.83
5. Step 5: Solve for x
   x = 167,317,949.83/13,380.32
6. Step 6: Final answer
   x = 12,504.78