Finding the Fourth Proportional to 13,380.18, 18,465.69 and 7,412.40

Step by Step Solution

1. Step 1: Write the proportion equation
   13,380.18 : 18,465.69 = 7,412.40 : x
2. Step 2: Convert to fraction form
   13,380.18/18,465.69 = 7,412.40/x
3. Step 3: Cross multiply
   13,380.18x = 18,465.69 × 7,412.40
4. Step 4: Simplify right side
   13,380.18x = 136,875,080.56
5. Step 5: Solve for x
   x = 136,875,080.56/13,380.18
6. Step 6: Final answer
   x = 10,229.69