Finding the Fourth Proportional to 2,123.44, 3,185.27 and 891.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.44 : 3,185.27 = 891.89 : x
2. Step 2: Convert to fraction form
   2,123.44/3,185.27 = 891.89/x
3. Step 3: Cross multiply
   2,123.44x = 3,185.27 × 891.89
4. Step 4: Simplify right side
   2,123.44x = 2,840,901.42
5. Step 5: Solve for x
   x = 2,840,901.42/2,123.44
6. Step 6: Final answer
   x = 1,337.88