Finding the Fourth Proportional to 2,123.23, 3,186.08 and 890.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.23 : 3,186.08 = 890.55 : x
2. Step 2: Convert to fraction form
   2,123.23/3,186.08 = 890.55/x
3. Step 3: Cross multiply
   2,123.23x = 3,186.08 × 890.55
4. Step 4: Simplify right side
   2,123.23x = 2,837,363.54
5. Step 5: Solve for x
   x = 2,837,363.54/2,123.23
6. Step 6: Final answer
   x = 1,336.34