Finding the Fourth Proportional to 2,421.78, 3,630.38 and 959.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,421.78 : 3,630.38 = 959.87 : x
2. Step 2: Convert to fraction form
   2,421.78/3,630.38 = 959.87/x
3. Step 3: Cross multiply
   2,421.78x = 3,630.38 × 959.87
4. Step 4: Simplify right side
   2,421.78x = 3,484,669.90
5. Step 5: Solve for x
   x = 3,484,669.90/2,421.78
6. Step 6: Final answer
   x = 1,438.89