Finding the Fourth Proportional to 2,288.80, 3,155.66 and 1,868.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,288.80 : 3,155.66 = 1,868.72 : x
2. Step 2: Convert to fraction form
   2,288.80/3,155.66 = 1,868.72/x
3. Step 3: Cross multiply
   2,288.80x = 3,155.66 × 1,868.72
4. Step 4: Simplify right side
   2,288.80x = 5,897,044.96
5. Step 5: Solve for x
   x = 5,897,044.96/2,288.80
6. Step 6: Final answer
   x = 2,576.48