Finding the Fourth Proportional to 2,056.87, 3,085.81 and 670.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,056.87 : 3,085.81 = 670.28 : x
2. Step 2: Convert to fraction form
   2,056.87/3,085.81 = 670.28/x
3. Step 3: Cross multiply
   2,056.87x = 3,085.81 × 670.28
4. Step 4: Simplify right side
   2,056.87x = 2,068,339.62
5. Step 5: Solve for x
   x = 2,068,339.62/2,056.87
6. Step 6: Final answer
   x = 1,005.58