Finding the Fourth Proportional to 13,386.39, 18,473.18 and 7,418.00

Step by Step Solution

1. Step 1: Write the proportion equation
   13,386.39 : 18,473.18 = 7,418.00 : x
2. Step 2: Convert to fraction form
   13,386.39/18,473.18 = 7,418.00/x
3. Step 3: Cross multiply
   13,386.39x = 18,473.18 × 7,418.00
4. Step 4: Simplify right side
   13,386.39x = 137,033,919.78
5. Step 5: Solve for x
   x = 137,033,919.78/13,386.39
6. Step 6: Final answer
   x = 10,236.81