Finding the Fourth Proportional to 2,015.50, 2,778.82 and 1,306.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.50 : 2,778.82 = 1,306.11 : x
2. Step 2: Convert to fraction form
   2,015.50/2,778.82 = 1,306.11/x
3. Step 3: Cross multiply
   2,015.50x = 2,778.82 × 1,306.11
4. Step 4: Simplify right side
   2,015.50x = 3,629,444.59
5. Step 5: Solve for x
   x = 3,629,444.59/2,015.50
6. Step 6: Final answer
   x = 1,800.77