Finding the Fourth Proportional to 2,081.16, 3,116.88 and 1,645.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.16 : 3,116.88 = 1,645.40 : x
2. Step 2: Convert to fraction form
   2,081.16/3,116.88 = 1,645.40/x
3. Step 3: Cross multiply
   2,081.16x = 3,116.88 × 1,645.40
4. Step 4: Simplify right side
   2,081.16x = 5,128,514.35
5. Step 5: Solve for x
   x = 5,128,514.35/2,081.16
6. Step 6: Final answer
   x = 2,464.26