Finding the Fourth Proportional to 2,638.58, 3,953.71 and 2,225.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.58 : 3,953.71 = 2,225.78 : x
2. Step 2: Convert to fraction form
   2,638.58/3,953.71 = 2,225.78/x
3. Step 3: Cross multiply
   2,638.58x = 3,953.71 × 2,225.78
4. Step 4: Simplify right side
   2,638.58x = 8,800,086.48
5. Step 5: Solve for x
   x = 8,800,086.48/2,638.58
6. Step 6: Final answer
   x = 3,335.17