Finding the Fourth Proportional to 1,865.31, 2,574.23 and 1,057.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,865.31 : 2,574.23 = 1,057.79 : x
2. Step 2: Convert to fraction form
   1,865.31/2,574.23 = 1,057.79/x
3. Step 3: Cross multiply
   1,865.31x = 2,574.23 × 1,057.79
4. Step 4: Simplify right side
   1,865.31x = 2,722,976.59
5. Step 5: Solve for x
   x = 2,722,976.59/1,865.31
6. Step 6: Final answer
   x = 1,459.80