Finding the Fourth Proportional to 13,380.22, 18,464.97 and 7,412.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,380.22 : 18,464.97 = 7,412.05 : x
2. Step 2: Convert to fraction form
   13,380.22/18,464.97 = 7,412.05/x
3. Step 3: Cross multiply
   13,380.22x = 18,464.97 × 7,412.05
4. Step 4: Simplify right side
   13,380.22x = 136,863,280.89
5. Step 5: Solve for x
   x = 136,863,280.89/13,380.22
6. Step 6: Final answer
   x = 10,228.78