Finding the Fourth Proportional to 2,770.07, 4,152.78 and 1,288.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,770.07 : 4,152.78 = 1,288.54 : x
2. Step 2: Convert to fraction form
   2,770.07/4,152.78 = 1,288.54/x
3. Step 3: Cross multiply
   2,770.07x = 4,152.78 × 1,288.54
4. Step 4: Simplify right side
   2,770.07x = 5,351,016.70
5. Step 5: Solve for x
   x = 5,351,016.70/2,770.07
6. Step 6: Final answer
   x = 1,931.73