Finding the Fourth Proportional to 2,011.83, 3,015.87 and 780.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,011.83 : 3,015.87 = 780.04 : x
2. Step 2: Convert to fraction form
   2,011.83/3,015.87 = 780.04/x
3. Step 3: Cross multiply
   2,011.83x = 3,015.87 × 780.04
4. Step 4: Simplify right side
   2,011.83x = 2,352,499.23
5. Step 5: Solve for x
   x = 2,352,499.23/2,011.83
6. Step 6: Final answer
   x = 1,169.33