Finding the Fourth Proportional to 2,103.98, 2,903.45 and 1,220.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.98 : 2,903.45 = 1,220.06 : x
2. Step 2: Convert to fraction form
   2,103.98/2,903.45 = 1,220.06/x
3. Step 3: Cross multiply
   2,103.98x = 2,903.45 × 1,220.06
4. Step 4: Simplify right side
   2,103.98x = 3,542,384.37
5. Step 5: Solve for x
   x = 3,542,384.37/2,103.98
6. Step 6: Final answer
   x = 1,683.66