Finding the Fourth Proportional to 2,012.88, 2,777.90 and 1,128.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.88 : 2,777.90 = 1,128.62 : x
2. Step 2: Convert to fraction form
   2,012.88/2,777.90 = 1,128.62/x
3. Step 3: Cross multiply
   2,012.88x = 2,777.90 × 1,128.62
4. Step 4: Simplify right side
   2,012.88x = 3,135,179.17
5. Step 5: Solve for x
   x = 3,135,179.17/2,012.88
6. Step 6: Final answer
   x = 1,557.56