Finding the Fourth Proportional to 2,722.78, 4,084.71 and 991.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,722.78 : 4,084.71 = 991.54 : x
2. Step 2: Convert to fraction form
   2,722.78/4,084.71 = 991.54/x
3. Step 3: Cross multiply
   2,722.78x = 4,084.71 × 991.54
4. Step 4: Simplify right side
   2,722.78x = 4,050,153.35
5. Step 5: Solve for x
   x = 4,050,153.35/2,722.78
6. Step 6: Final answer
   x = 1,487.51