Finding the Fourth Proportional to 2,012.78, 3,019.56 and 714.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.78 : 3,019.56 = 714.20 : x
2. Step 2: Convert to fraction form
   2,012.78/3,019.56 = 714.20/x
3. Step 3: Cross multiply
   2,012.78x = 3,019.56 × 714.20
4. Step 4: Simplify right side
   2,012.78x = 2,156,569.75
5. Step 5: Solve for x
   x = 2,156,569.75/2,012.78
6. Step 6: Final answer
   x = 1,071.44