Finding the Fourth Proportional to 2,015.91, 3,005.83 and 1,985.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.91 : 3,005.83 = 1,985.16 : x
2. Step 2: Convert to fraction form
   2,015.91/3,005.83 = 1,985.16/x
3. Step 3: Cross multiply
   2,015.91x = 3,005.83 × 1,985.16
4. Step 4: Simplify right side
   2,015.91x = 5,967,055.91
5. Step 5: Solve for x
   x = 5,967,055.91/2,015.91
6. Step 6: Final answer
   x = 2,959.98