Finding the Fourth Proportional to 13,385.40, 18,471.60 and 7,417.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,385.40 : 18,471.60 = 7,417.05 : x
2. Step 2: Convert to fraction form
   13,385.40/18,471.60 = 7,417.05/x
3. Step 3: Cross multiply
   13,385.40x = 18,471.60 × 7,417.05
4. Step 4: Simplify right side
   13,385.40x = 137,004,780.78
5. Step 5: Solve for x
   x = 137,004,780.78/13,385.40
6. Step 6: Final answer
   x = 10,235.39