Finding the Fourth Proportional to 1,401.50, 2,103.78 and 961.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.50 : 2,103.78 = 961.40 : x
2. Step 2: Convert to fraction form
   1,401.50/2,103.78 = 961.40/x
3. Step 3: Cross multiply
   1,401.50x = 2,103.78 × 961.40
4. Step 4: Simplify right side
   1,401.50x = 2,022,574.09
5. Step 5: Solve for x
   x = 2,022,574.09/1,401.50
6. Step 6: Final answer
   x = 1,443.15