Finding the Fourth Proportional to 1,687.43, 2,327.72 and 1,057.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,687.43 : 2,327.72 = 1,057.82 : x
2. Step 2: Convert to fraction form
   1,687.43/2,327.72 = 1,057.82/x
3. Step 3: Cross multiply
   1,687.43x = 2,327.72 × 1,057.82
4. Step 4: Simplify right side
   1,687.43x = 2,462,291.84
5. Step 5: Solve for x
   x = 2,462,291.84/1,687.43
6. Step 6: Final answer
   x = 1,459.20