Finding the Fourth Proportional to 2,012.51, 2,777.39 and 1,128.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.51 : 2,777.39 = 1,128.37 : x
2. Step 2: Convert to fraction form
   2,012.51/2,777.39 = 1,128.37/x
3. Step 3: Cross multiply
   2,012.51x = 2,777.39 × 1,128.37
4. Step 4: Simplify right side
   2,012.51x = 3,133,923.55
5. Step 5: Solve for x
   x = 3,133,923.55/2,012.51
6. Step 6: Final answer
   x = 1,557.22