Finding the Fourth Proportional to 2,171.78, 3,258.21 and 632.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.78 : 3,258.21 = 632.78 : x
2. Step 2: Convert to fraction form
   2,171.78/3,258.21 = 632.78/x
3. Step 3: Cross multiply
   2,171.78x = 3,258.21 × 632.78
4. Step 4: Simplify right side
   2,171.78x = 2,061,730.12
5. Step 5: Solve for x
   x = 2,061,730.12/2,171.78
6. Step 6: Final answer
   x = 949.33