Finding the Fourth Proportional to 1,691.69, 2,334.56 and 1,028.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,691.69 : 2,334.56 = 1,028.57 : x
2. Step 2: Convert to fraction form
   1,691.69/2,334.56 = 1,028.57/x
3. Step 3: Cross multiply
   1,691.69x = 2,334.56 × 1,028.57
4. Step 4: Simplify right side
   1,691.69x = 2,401,241.56
5. Step 5: Solve for x
   x = 2,401,241.56/1,691.69
6. Step 6: Final answer
   x = 1,419.44