Finding the Fourth Proportional to 2,012.72, 2,777.55 and 1,128.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.72 : 2,777.55 = 1,128.53 : x
2. Step 2: Convert to fraction form
   2,012.72/2,777.55 = 1,128.53/x
3. Step 3: Cross multiply
   2,012.72x = 2,777.55 × 1,128.53
4. Step 4: Simplify right side
   2,012.72x = 3,134,548.50
5. Step 5: Solve for x
   x = 3,134,548.50/2,012.72
6. Step 6: Final answer
   x = 1,557.37