Finding the Fourth Proportional to 2,104.53, 2,904.53 and 1,220.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,104.53 : 2,904.53 = 1,220.15 : x
2. Step 2: Convert to fraction form
   2,104.53/2,904.53 = 1,220.15/x
3. Step 3: Cross multiply
   2,104.53x = 2,904.53 × 1,220.15
4. Step 4: Simplify right side
   2,104.53x = 3,543,941.66
5. Step 5: Solve for x
   x = 3,543,941.66/2,104.53
6. Step 6: Final answer
   x = 1,683.96