Finding the Fourth Proportional to 2,072.76, 2,860.29 and 1,128.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.76 : 2,860.29 = 1,128.51 : x
2. Step 2: Convert to fraction form
   2,072.76/2,860.29 = 1,128.51/x
3. Step 3: Cross multiply
   2,072.76x = 2,860.29 × 1,128.51
4. Step 4: Simplify right side
   2,072.76x = 3,227,865.87
5. Step 5: Solve for x
   x = 3,227,865.87/2,072.76
6. Step 6: Final answer
   x = 1,557.28