Finding the Fourth Proportional to 13,514.52, 18,662.88 and 12,778.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,514.52 : 18,662.88 = 12,778.20 : x
2. Step 2: Convert to fraction form
   13,514.52/18,662.88 = 12,778.20/x
3. Step 3: Cross multiply
   13,514.52x = 18,662.88 × 12,778.20
4. Step 4: Simplify right side
   13,514.52x = 238,478,013.22
5. Step 5: Solve for x
   x = 238,478,013.22/13,514.52
6. Step 6: Final answer
   x = 17,646.06