Finding the Fourth Proportional to 2,103.67, 2,904.05 and 1,219.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.67 : 2,904.05 = 1,219.31 : x
2. Step 2: Convert to fraction form
   2,103.67/2,904.05 = 1,219.31/x
3. Step 3: Cross multiply
   2,103.67x = 2,904.05 × 1,219.31
4. Step 4: Simplify right side
   2,103.67x = 3,540,937.21
5. Step 5: Solve for x
   x = 3,540,937.21/2,103.67
6. Step 6: Final answer
   x = 1,683.22