Finding the Fourth Proportional to 3,111.40, 4,293.70 and 1,785.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.40 : 4,293.70 = 1,785.31 : x
2. Step 2: Convert to fraction form
   3,111.40/4,293.70 = 1,785.31/x
3. Step 3: Cross multiply
   3,111.40x = 4,293.70 × 1,785.31
4. Step 4: Simplify right side
   3,111.40x = 7,665,594.50
5. Step 5: Solve for x
   x = 7,665,594.50/3,111.40
6. Step 6: Final answer
   x = 2,463.71