Finding the Fourth Proportional to 1,685.72, 2,327.73 and 1,057.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,685.72 : 2,327.73 = 1,057.31 : x
2. Step 2: Convert to fraction form
   1,685.72/2,327.73 = 1,057.31/x
3. Step 3: Cross multiply
   1,685.72x = 2,327.73 × 1,057.31
4. Step 4: Simplify right side
   1,685.72x = 2,461,115.28
5. Step 5: Solve for x
   x = 2,461,115.28/1,685.72
6. Step 6: Final answer
   x = 1,459.98