Finding the Fourth Proportional to 1,687.43, 2,328.78 and 979.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,687.43 : 2,328.78 = 979.46 : x
2. Step 2: Convert to fraction form
   1,687.43/2,328.78 = 979.46/x
3. Step 3: Cross multiply
   1,687.43x = 2,328.78 × 979.46
4. Step 4: Simplify right side
   1,687.43x = 2,280,946.86
5. Step 5: Solve for x
   x = 2,280,946.86/1,687.43
6. Step 6: Final answer
   x = 1,351.73