Finding the Fourth Proportional to 42,218.27, 63,344.85 and 18,513.55

Step by Step Solution

1. Step 1: Write the proportion equation
   42,218.27 : 63,344.85 = 18,513.55 : x
2. Step 2: Convert to fraction form
   42,218.27/63,344.85 = 18,513.55/x
3. Step 3: Cross multiply
   42,218.27x = 63,344.85 × 18,513.55
4. Step 4: Simplify right side
   42,218.27x = 1,172,738,047.72
5. Step 5: Solve for x
   x = 1,172,738,047.72/42,218.27
6. Step 6: Final answer
   x = 27,777.97