Finding the Fourth Proportional to 800.79, 1,105.19 and 469.15

Step by Step Solution

1. Step 1: Write the proportion equation
   800.79 : 1,105.19 = 469.15 : x
2. Step 2: Convert to fraction form
   800.79/1,105.19 = 469.15/x
3. Step 3: Cross multiply
   800.79x = 1,105.19 × 469.15
4. Step 4: Simplify right side
   800.79x = 518,499.89
5. Step 5: Solve for x
   x = 518,499.89/800.79
6. Step 6: Final answer
   x = 647.49