Finding the Fourth Proportional to 2,052.78, 3,078.78 and 1,012.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,052.78 : 3,078.78 = 1,012.43 : x
2. Step 2: Convert to fraction form
   2,052.78/3,078.78 = 1,012.43/x
3. Step 3: Cross multiply
   2,052.78x = 3,078.78 × 1,012.43
4. Step 4: Simplify right side
   2,052.78x = 3,117,033.84
5. Step 5: Solve for x
   x = 3,117,033.84/2,052.78
6. Step 6: Final answer
   x = 1,518.45