Finding the Fourth Proportional to 2,015.31, 3,008.86 and 1,891.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.31 : 3,008.86 = 1,891.71 : x
2. Step 2: Convert to fraction form
   2,015.31/3,008.86 = 1,891.71/x
3. Step 3: Cross multiply
   2,015.31x = 3,008.86 × 1,891.71
4. Step 4: Simplify right side
   2,015.31x = 5,691,885.82
5. Step 5: Solve for x
   x = 5,691,885.82/2,015.31
6. Step 6: Final answer
   x = 2,824.32