Finding the Fourth Proportional to 2,275.76, 3,411.57 and 890.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.76 : 3,411.57 = 890.30 : x
2. Step 2: Convert to fraction form
   2,275.76/3,411.57 = 890.30/x
3. Step 3: Cross multiply
   2,275.76x = 3,411.57 × 890.30
4. Step 4: Simplify right side
   2,275.76x = 3,037,320.77
5. Step 5: Solve for x
   x = 3,037,320.77/2,275.76
6. Step 6: Final answer
   x = 1,334.64