Finding the Fourth Proportional to 2,019.80, 2,787.55 and 1,123.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,019.80 : 2,787.55 = 1,123.63 : x
2. Step 2: Convert to fraction form
   2,019.80/2,787.55 = 1,123.63/x
3. Step 3: Cross multiply
   2,019.80x = 2,787.55 × 1,123.63
4. Step 4: Simplify right side
   2,019.80x = 3,132,174.81
5. Step 5: Solve for x
   x = 3,132,174.81/2,019.80
6. Step 6: Final answer
   x = 1,550.74