Finding the Fourth Proportional to 42,218.78, 63,345.60 and 18,514.05

Step by Step Solution

1. Step 1: Write the proportion equation
   42,218.78 : 63,345.60 = 18,514.05 : x
2. Step 2: Convert to fraction form
   42,218.78/63,345.60 = 18,514.05/x
3. Step 3: Cross multiply
   42,218.78x = 63,345.60 × 18,514.05
4. Step 4: Simplify right side
   42,218.78x = 1,172,783,605.68
5. Step 5: Solve for x
   x = 1,172,783,605.68/42,218.78
6. Step 6: Final answer
   x = 27,778.72