Finding the Fourth Proportional to 1,686.69, 2,327.55 and 1,057.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,686.69 : 2,327.55 = 1,057.25 : x
2. Step 2: Convert to fraction form
   1,686.69/2,327.55 = 1,057.25/x
3. Step 3: Cross multiply
   1,686.69x = 2,327.55 × 1,057.25
4. Step 4: Simplify right side
   1,686.69x = 2,460,802.24
5. Step 5: Solve for x
   x = 2,460,802.24/1,686.69
6. Step 6: Final answer
   x = 1,458.95