Finding the Fourth Proportional to 3,998.72, 5,516.94 and 2,229.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,998.72 : 5,516.94 = 2,229.98 : x
2. Step 2: Convert to fraction form
   3,998.72/5,516.94 = 2,229.98/x
3. Step 3: Cross multiply
   3,998.72x = 5,516.94 × 2,229.98
4. Step 4: Simplify right side
   3,998.72x = 12,302,665.86
5. Step 5: Solve for x
   x = 12,302,665.86/3,998.72
6. Step 6: Final answer
   x = 3,076.65