Finding the Fourth Proportional to 2,391.78, 3,588.21 and 748.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,391.78 : 3,588.21 = 748.56 : x
2. Step 2: Convert to fraction form
   2,391.78/3,588.21 = 748.56/x
3. Step 3: Cross multiply
   2,391.78x = 3,588.21 × 748.56
4. Step 4: Simplify right side
   2,391.78x = 2,685,990.48
5. Step 5: Solve for x
   x = 2,685,990.48/2,391.78
6. Step 6: Final answer
   x = 1,123.01