Finding the Fourth Proportional to 1,921.59, 2,883.53 and 689.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921.59 : 2,883.53 = 689.31 : x
2. Step 2: Convert to fraction form
   1,921.59/2,883.53 = 689.31/x
3. Step 3: Cross multiply
   1,921.59x = 2,883.53 × 689.31
4. Step 4: Simplify right side
   1,921.59x = 1,987,647.79
5. Step 5: Solve for x
   x = 1,987,647.79/1,921.59
6. Step 6: Final answer
   x = 1,034.38