Finding the Fourth Proportional to 2,209.83, 3,049.77 and 1,215.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,209.83 : 3,049.77 = 1,215.31 : x
2. Step 2: Convert to fraction form
   2,209.83/3,049.77 = 1,215.31/x
3. Step 3: Cross multiply
   2,209.83x = 3,049.77 × 1,215.31
4. Step 4: Simplify right side
   2,209.83x = 3,706,415.98
5. Step 5: Solve for x
   x = 3,706,415.98/2,209.83
6. Step 6: Final answer
   x = 1,677.24