Finding the Fourth Proportional to 2,085.10, 3,113.65 and 1,811.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.10 : 3,113.65 = 1,811.86 : x
2. Step 2: Convert to fraction form
   2,085.10/3,113.65 = 1,811.86/x
3. Step 3: Cross multiply
   2,085.10x = 3,113.65 × 1,811.86
4. Step 4: Simplify right side
   2,085.10x = 5,641,497.89
5. Step 5: Solve for x
   x = 5,641,497.89/2,085.10
6. Step 6: Final answer
   x = 2,705.62