Finding the Fourth Proportional to 2,012.79, 2,777.62 and 1,128.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.79 : 2,777.62 = 1,128.59 : x
2. Step 2: Convert to fraction form
   2,012.79/2,777.62 = 1,128.59/x
3. Step 3: Cross multiply
   2,012.79x = 2,777.62 × 1,128.59
4. Step 4: Simplify right side
   2,012.79x = 3,134,788.51
5. Step 5: Solve for x
   x = 3,134,788.51/2,012.79
6. Step 6: Final answer
   x = 1,557.43