Finding the Fourth Proportional to 2,028.77, 2,799.71 and 1,189.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,028.77 : 2,799.71 = 1,189.31 : x
2. Step 2: Convert to fraction form
   2,028.77/2,799.71 = 1,189.31/x
3. Step 3: Cross multiply
   2,028.77x = 2,799.71 × 1,189.31
4. Step 4: Simplify right side
   2,028.77x = 3,329,723.10
5. Step 5: Solve for x
   x = 3,329,723.10/2,028.77
6. Step 6: Final answer
   x = 1,641.25