Finding the Fourth Proportional to 2,015.91, 2,780.46 and 1,927.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.91 : 2,780.46 = 1,927.59 : x
2. Step 2: Convert to fraction form
   2,015.91/2,780.46 = 1,927.59/x
3. Step 3: Cross multiply
   2,015.91x = 2,780.46 × 1,927.59
4. Step 4: Simplify right side
   2,015.91x = 5,359,586.89
5. Step 5: Solve for x
   x = 5,359,586.89/2,015.91
6. Step 6: Final answer
   x = 2,658.64