Finding the Fourth Proportional to 2,012.81, 3,015.69 and 1,396.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.81 : 3,015.69 = 1,396.91 : x
2. Step 2: Convert to fraction form
   2,012.81/3,015.69 = 1,396.91/x
3. Step 3: Cross multiply
   2,012.81x = 3,015.69 × 1,396.91
4. Step 4: Simplify right side
   2,012.81x = 4,212,625.45
5. Step 5: Solve for x
   x = 4,212,625.45/2,012.81
6. Step 6: Final answer
   x = 2,092.91