Finding the Fourth Proportional to 2,647.37, 3,970.51 and 1,085.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.37 : 3,970.51 = 1,085.85 : x
2. Step 2: Convert to fraction form
   2,647.37/3,970.51 = 1,085.85/x
3. Step 3: Cross multiply
   2,647.37x = 3,970.51 × 1,085.85
4. Step 4: Simplify right side
   2,647.37x = 4,311,375.57
5. Step 5: Solve for x
   x = 4,311,375.57/2,647.37
6. Step 6: Final answer
   x = 1,628.55