Finding the Fourth Proportional to 2,123.01, 3,185.66 and 890.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.01 : 3,185.66 = 890.12 : x
2. Step 2: Convert to fraction form
   2,123.01/3,185.66 = 890.12/x
3. Step 3: Cross multiply
   2,123.01x = 3,185.66 × 890.12
4. Step 4: Simplify right side
   2,123.01x = 2,835,629.87
5. Step 5: Solve for x
   x = 2,835,629.87/2,123.01
6. Step 6: Final answer
   x = 1,335.66