Finding the Fourth Proportional to 1,336.38, 2,002.74 and 816.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,336.38 : 2,002.74 = 816.56 : x
2. Step 2: Convert to fraction form
   1,336.38/2,002.74 = 816.56/x
3. Step 3: Cross multiply
   1,336.38x = 2,002.74 × 816.56
4. Step 4: Simplify right side
   1,336.38x = 1,635,356.40
5. Step 5: Solve for x
   x = 1,635,356.40/1,336.38
6. Step 6: Final answer
   x = 1,223.72