Finding the Fourth Proportional to 800.52, 1,104.83 and 485.91

Step by Step Solution

1. Step 1: Write the proportion equation
   800.52 : 1,104.83 = 485.91 : x
2. Step 2: Convert to fraction form
   800.52/1,104.83 = 485.91/x
3. Step 3: Cross multiply
   800.52x = 1,104.83 × 485.91
4. Step 4: Simplify right side
   800.52x = 536,847.34
5. Step 5: Solve for x
   x = 536,847.34/800.52
6. Step 6: Final answer
   x = 670.63