Finding the Fourth Proportional to 2,081.78, 3,125.15 and 1,649.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.78 : 3,125.15 = 1,649.30 : x
2. Step 2: Convert to fraction form
   2,081.78/3,125.15 = 1,649.30/x
3. Step 3: Cross multiply
   2,081.78x = 3,125.15 × 1,649.30
4. Step 4: Simplify right side
   2,081.78x = 5,154,309.90
5. Step 5: Solve for x
   x = 5,154,309.90/2,081.78
6. Step 6: Final answer
   x = 2,475.91