Finding the Fourth Proportional to 2,864.31, 4,296.57 and 890.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,864.31 : 4,296.57 = 890.45 : x
2. Step 2: Convert to fraction form
   2,864.31/4,296.57 = 890.45/x
3. Step 3: Cross multiply
   2,864.31x = 4,296.57 × 890.45
4. Step 4: Simplify right side
   2,864.31x = 3,825,880.76
5. Step 5: Solve for x
   x = 3,825,880.76/2,864.31
6. Step 6: Final answer
   x = 1,335.71