Finding the Fourth Proportional to 2,592.78, 3,888.38 and 743.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,592.78 : 3,888.38 = 743.40 : x
2. Step 2: Convert to fraction form
   2,592.78/3,888.38 = 743.40/x
3. Step 3: Cross multiply
   2,592.78x = 3,888.38 × 743.40
4. Step 4: Simplify right side
   2,592.78x = 2,890,627.70
5. Step 5: Solve for x
   x = 2,890,627.70/2,592.78
6. Step 6: Final answer
   x = 1,114.87