Finding the Fourth Proportional to 1,371.20, 1,891.78 and 951.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.20 : 1,891.78 = 951.40 : x
2. Step 2: Convert to fraction form
   1,371.20/1,891.78 = 951.40/x
3. Step 3: Cross multiply
   1,371.20x = 1,891.78 × 951.40
4. Step 4: Simplify right side
   1,371.20x = 1,799,839.49
5. Step 5: Solve for x
   x = 1,799,839.49/1,371.20
6. Step 6: Final answer
   x = 1,312.60