Finding the Fourth Proportional to 2,086.90, 3,122.04 and 1,621.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.90 : 3,122.04 = 1,621.12 : x
2. Step 2: Convert to fraction form
   2,086.90/3,122.04 = 1,621.12/x
3. Step 3: Cross multiply
   2,086.90x = 3,122.04 × 1,621.12
4. Step 4: Simplify right side
   2,086.90x = 5,061,201.48
5. Step 5: Solve for x
   x = 5,061,201.48/2,086.90
6. Step 6: Final answer
   x = 2,425.22