Finding the Fourth Proportional to 2,012.69, 2,777.31 and 1,128.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.69 : 2,777.31 = 1,128.31 : x
2. Step 2: Convert to fraction form
   2,012.69/2,777.31 = 1,128.31/x
3. Step 3: Cross multiply
   2,012.69x = 2,777.31 × 1,128.31
4. Step 4: Simplify right side
   2,012.69x = 3,133,659.70
5. Step 5: Solve for x
   x = 3,133,659.70/2,012.69
6. Step 6: Final answer
   x = 1,556.95