Finding the Fourth Proportional to 2,012.45, 2,777.18 and 1,128.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.45 : 2,777.18 = 1,128.25 : x
2. Step 2: Convert to fraction form
   2,012.45/2,777.18 = 1,128.25/x
3. Step 3: Cross multiply
   2,012.45x = 2,777.18 × 1,128.25
4. Step 4: Simplify right side
   2,012.45x = 3,133,338.72
5. Step 5: Solve for x
   x = 3,133,338.72/2,012.45
6. Step 6: Final answer
   x = 1,556.98