Finding the Fourth Proportional to 2,057.33, 3,085.34 and 670.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.33 : 3,085.34 = 670.31 : x
2. Step 2: Convert to fraction form
   2,057.33/3,085.34 = 670.31/x
3. Step 3: Cross multiply
   2,057.33x = 3,085.34 × 670.31
4. Step 4: Simplify right side
   2,057.33x = 2,068,115.48
5. Step 5: Solve for x
   x = 2,068,115.48/2,057.33
6. Step 6: Final answer
   x = 1,005.24