Finding the Fourth Proportional to 1,657.89, 2,287.76 and 959.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,657.89 : 2,287.76 = 959.31 : x
2. Step 2: Convert to fraction form
   1,657.89/2,287.76 = 959.31/x
3. Step 3: Cross multiply
   1,657.89x = 2,287.76 × 959.31
4. Step 4: Simplify right side
   1,657.89x = 2,194,666.25
5. Step 5: Solve for x
   x = 2,194,666.25/1,657.89
6. Step 6: Final answer
   x = 1,323.77