Finding the Fourth Proportional to 800.72, 1,200.72 and 368

Step by Step Solution

1. Step 1: Write the proportion equation
   800.72 : 1,200.72 = 368 : x
2. Step 2: Convert to fraction form
   800.72/1,200.72 = 368/x
3. Step 3: Cross multiply
   800.72x = 1,200.72 × 368
4. Step 4: Simplify right side
   800.72x = 441,864.96
5. Step 5: Solve for x
   x = 441,864.96/800.72
6. Step 6: Final answer
   x = 551.83