Finding the Fourth Proportional to 2,136.78, 3,204.56 and 904.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,136.78 : 3,204.56 = 904.23 : x
2. Step 2: Convert to fraction form
   2,136.78/3,204.56 = 904.23/x
3. Step 3: Cross multiply
   2,136.78x = 3,204.56 × 904.23
4. Step 4: Simplify right side
   2,136.78x = 2,897,661.55
5. Step 5: Solve for x
   x = 2,897,661.55/2,136.78
6. Step 6: Final answer
   x = 1,356.09