Finding the Fourth Proportional to 3,987.74, 5,979.86 and 2,012.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987.74 : 5,979.86 = 2,012.15 : x
2. Step 2: Convert to fraction form
   3,987.74/5,979.86 = 2,012.15/x
3. Step 3: Cross multiply
   3,987.74x = 5,979.86 × 2,012.15
4. Step 4: Simplify right side
   3,987.74x = 12,032,375.30
5. Step 5: Solve for x
   x = 12,032,375.30/3,987.74
6. Step 6: Final answer
   x = 3,017.34