Finding the Fourth Proportional to 2,123.91, 3,185.37 and 891.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.91 : 3,185.37 = 891.18 : x
2. Step 2: Convert to fraction form
   2,123.91/3,185.37 = 891.18/x
3. Step 3: Cross multiply
   2,123.91x = 3,185.37 × 891.18
4. Step 4: Simplify right side
   2,123.91x = 2,838,738.04
5. Step 5: Solve for x
   x = 2,838,738.04/2,123.91
6. Step 6: Final answer
   x = 1,336.56