Finding the Fourth Proportional to 2,058.21, 3,087.72 and 759.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,058.21 : 3,087.72 = 759.78 : x
2. Step 2: Convert to fraction form
   2,058.21/3,087.72 = 759.78/x
3. Step 3: Cross multiply
   2,058.21x = 3,087.72 × 759.78
4. Step 4: Simplify right side
   2,058.21x = 2,345,987.90
5. Step 5: Solve for x
   x = 2,345,987.90/2,058.21
6. Step 6: Final answer
   x = 1,139.82