Finding the Fourth Proportional to 2,081.38, 3,120.21 and 764.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.38 : 3,120.21 = 764.83 : x
2. Step 2: Convert to fraction form
   2,081.38/3,120.21 = 764.83/x
3. Step 3: Cross multiply
   2,081.38x = 3,120.21 × 764.83
4. Step 4: Simplify right side
   2,081.38x = 2,386,430.21
5. Step 5: Solve for x
   x = 2,386,430.21/2,081.38
6. Step 6: Final answer
   x = 1,146.56