Finding the Fourth Proportional to 1,574.93, 2,171.31 and 1,309.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,574.93 : 2,171.31 = 1,309.59 : x
2. Step 2: Convert to fraction form
   1,574.93/2,171.31 = 1,309.59/x
3. Step 3: Cross multiply
   1,574.93x = 2,171.31 × 1,309.59
4. Step 4: Simplify right side
   1,574.93x = 2,843,525.86
5. Step 5: Solve for x
   x = 2,843,525.86/1,574.93
6. Step 6: Final answer
   x = 1,805.50