Finding the Fourth Proportional to 2,015.21, 2,781.24 and 1,229.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.21 : 2,781.24 = 1,229.06 : x
2. Step 2: Convert to fraction form
   2,015.21/2,781.24 = 1,229.06/x
3. Step 3: Cross multiply
   2,015.21x = 2,781.24 × 1,229.06
4. Step 4: Simplify right side
   2,015.21x = 3,418,310.83
5. Step 5: Solve for x
   x = 3,418,310.83/2,015.21
6. Step 6: Final answer
   x = 1,696.26