Finding the Fourth Proportional to 2,123.65, 3,186.16 and 890.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.65 : 3,186.16 = 890.73 : x
2. Step 2: Convert to fraction form
   2,123.65/3,186.16 = 890.73/x
3. Step 3: Cross multiply
   2,123.65x = 3,186.16 × 890.73
4. Step 4: Simplify right side
   2,123.65x = 2,837,995.88
5. Step 5: Solve for x
   x = 2,837,995.88/2,123.65
6. Step 6: Final answer
   x = 1,336.38