Finding the Fourth Proportional to 2,123.10, 3,184.62 and 890.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.10 : 3,184.62 = 890.40 : x
2. Step 2: Convert to fraction form
   2,123.10/3,184.62 = 890.40/x
3. Step 3: Cross multiply
   2,123.10x = 3,184.62 × 890.40
4. Step 4: Simplify right side
   2,123.10x = 2,835,585.65
5. Step 5: Solve for x
   x = 2,835,585.65/2,123.10
6. Step 6: Final answer
   x = 1,335.59