Finding the Fourth Proportional to 2,012.49, 2,777.13 and 1,128.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.49 : 2,777.13 = 1,128.15 : x
2. Step 2: Convert to fraction form
   2,012.49/2,777.13 = 1,128.15/x
3. Step 3: Cross multiply
   2,012.49x = 2,777.13 × 1,128.15
4. Step 4: Simplify right side
   2,012.49x = 3,133,019.21
5. Step 5: Solve for x
   x = 3,133,019.21/2,012.49
6. Step 6: Final answer
   x = 1,556.79