Finding the Fourth Proportional to 2,057.39, 3,085.39 and 670.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.39 : 3,085.39 = 670.35 : x
2. Step 2: Convert to fraction form
   2,057.39/3,085.39 = 670.35/x
3. Step 3: Cross multiply
   2,057.39x = 3,085.39 × 670.35
4. Step 4: Simplify right side
   2,057.39x = 2,068,303.59
5. Step 5: Solve for x
   x = 2,068,303.59/2,057.39
6. Step 6: Final answer
   x = 1,005.31