Finding the Fourth Proportional to 2,015.91, 2,780.54 and 1,850.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.91 : 2,780.54 = 1,850.67 : x
2. Step 2: Convert to fraction form
   2,015.91/2,780.54 = 1,850.67/x
3. Step 3: Cross multiply
   2,015.91x = 2,780.54 × 1,850.67
4. Step 4: Simplify right side
   2,015.91x = 5,145,852.71
5. Step 5: Solve for x
   x = 5,145,852.71/2,015.91
6. Step 6: Final answer
   x = 2,552.62