Finding the Fourth Proportional to 13,387.35, 18,475.28 and 7,418.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,387.35 : 18,475.28 = 7,418.89 : x
2. Step 2: Convert to fraction form
   13,387.35/18,475.28 = 7,418.89/x
3. Step 3: Cross multiply
   13,387.35x = 18,475.28 × 7,418.89
4. Step 4: Simplify right side
   13,387.35x = 137,065,940.57
5. Step 5: Solve for x
   x = 137,065,940.57/13,387.35
6. Step 6: Final answer
   x = 10,238.47