Finding the Fourth Proportional to 13,488.59, 18,616.69 and 8,457.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,488.59 : 18,616.69 = 8,457.18 : x
2. Step 2: Convert to fraction form
   13,488.59/18,616.69 = 8,457.18/x
3. Step 3: Cross multiply
   13,488.59x = 18,616.69 × 8,457.18
4. Step 4: Simplify right side
   13,488.59x = 157,444,698.33
5. Step 5: Solve for x
   x = 157,444,698.33/13,488.59
6. Step 6: Final answer
   x = 11,672.44