Finding the Fourth Proportional to 1,691.55, 2,334.21 and 1,028.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,691.55 : 2,334.21 = 1,028.31 : x
2. Step 2: Convert to fraction form
   1,691.55/2,334.21 = 1,028.31/x
3. Step 3: Cross multiply
   1,691.55x = 2,334.21 × 1,028.31
4. Step 4: Simplify right side
   1,691.55x = 2,400,291.49
5. Step 5: Solve for x
   x = 2,400,291.49/1,691.55
6. Step 6: Final answer
   x = 1,418.99