Finding the Fourth Proportional to 2,123.89, 3,185.84 and 663.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.89 : 3,185.84 = 663.05 : x
2. Step 2: Convert to fraction form
   2,123.89/3,185.84 = 663.05/x
3. Step 3: Cross multiply
   2,123.89x = 3,185.84 × 663.05
4. Step 4: Simplify right side
   2,123.89x = 2,112,380.83
5. Step 5: Solve for x
   x = 2,112,380.83/2,123.89
6. Step 6: Final answer
   x = 994.58