Finding the Fourth Proportional to 2,136.39, 2,949.55 and 1,638.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,136.39 : 2,949.55 = 1,638.07 : x
2. Step 2: Convert to fraction form
   2,136.39/2,949.55 = 1,638.07/x
3. Step 3: Cross multiply
   2,136.39x = 2,949.55 × 1,638.07
4. Step 4: Simplify right side
   2,136.39x = 4,831,557.90
5. Step 5: Solve for x
   x = 4,831,557.90/2,136.39
6. Step 6: Final answer
   x = 2,261.56