Finding the Fourth Proportional to 2,085.86, 3,111.13 and 1,809.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.86 : 3,111.13 = 1,809.76 : x
2. Step 2: Convert to fraction form
   2,085.86/3,111.13 = 1,809.76/x
3. Step 3: Cross multiply
   2,085.86x = 3,111.13 × 1,809.76
4. Step 4: Simplify right side
   2,085.86x = 5,630,398.63
5. Step 5: Solve for x
   x = 5,630,398.63/2,085.86
6. Step 6: Final answer
   x = 2,699.32