Finding the Fourth Proportional to 3,139.22, 4,705.95 and 1,085.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,139.22 : 4,705.95 = 1,085.78 : x
2. Step 2: Convert to fraction form
   3,139.22/4,705.95 = 1,085.78/x
3. Step 3: Cross multiply
   3,139.22x = 4,705.95 × 1,085.78
4. Step 4: Simplify right side
   3,139.22x = 5,109,626.39
5. Step 5: Solve for x
   x = 5,109,626.39/3,139.22
6. Step 6: Final answer
   x = 1,627.67