Finding the Fourth Proportional to 2,209.93, 3,049.71 and 1,215.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,209.93 : 3,049.71 = 1,215.31 : x
2. Step 2: Convert to fraction form
   2,209.93/3,049.71 = 1,215.31/x
3. Step 3: Cross multiply
   2,209.93x = 3,049.71 × 1,215.31
4. Step 4: Simplify right side
   2,209.93x = 3,706,343.06
5. Step 5: Solve for x
   x = 3,706,343.06/2,209.93
6. Step 6: Final answer
   x = 1,677.13