Finding the Fourth Proportional to 2,451.31, 3,675.90 and 890.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,451.31 : 3,675.90 = 890.80 : x
2. Step 2: Convert to fraction form
   2,451.31/3,675.90 = 890.80/x
3. Step 3: Cross multiply
   2,451.31x = 3,675.90 × 890.80
4. Step 4: Simplify right side
   2,451.31x = 3,274,473.34
5. Step 5: Solve for x
   x = 3,274,473.34/2,451.31
6. Step 6: Final answer
   x = 1,335.81