Finding the Fourth Proportional to 2,057.20, 3,085.98 and 670.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.20 : 3,085.98 = 670.17 : x
2. Step 2: Convert to fraction form
   2,057.20/3,085.98 = 670.17/x
3. Step 3: Cross multiply
   2,057.20x = 3,085.98 × 670.17
4. Step 4: Simplify right side
   2,057.20x = 2,068,131.22
5. Step 5: Solve for x
   x = 2,068,131.22/2,057.20
6. Step 6: Final answer
   x = 1,005.31