Finding the Fourth Proportional to 2,071.87, 3,109.52 and 1,085.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.87 : 3,109.52 = 1,085.79 : x
2. Step 2: Convert to fraction form
   2,071.87/3,109.52 = 1,085.79/x
3. Step 3: Cross multiply
   2,071.87x = 3,109.52 × 1,085.79
4. Step 4: Simplify right side
   2,071.87x = 3,376,285.72
5. Step 5: Solve for x
   x = 3,376,285.72/2,071.87
6. Step 6: Final answer
   x = 1,629.58