Finding the Fourth Proportional to 2,809.31, 3,874.52 and 2,109.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,809.31 : 3,874.52 = 2,109.47 : x
2. Step 2: Convert to fraction form
   2,809.31/3,874.52 = 2,109.47/x
3. Step 3: Cross multiply
   2,809.31x = 3,874.52 × 2,109.47
4. Step 4: Simplify right side
   2,809.31x = 8,173,173.16
5. Step 5: Solve for x
   x = 8,173,173.16/2,809.31
6. Step 6: Final answer
   x = 2,909.32