Finding the Fourth Proportional to 870.33, 1,308.24 and 804.72

Step by Step Solution

1. Step 1: Write the proportion equation
   870.33 : 1,308.24 = 804.72 : x
2. Step 2: Convert to fraction form
   870.33/1,308.24 = 804.72/x
3. Step 3: Cross multiply
   870.33x = 1,308.24 × 804.72
4. Step 4: Simplify right side
   870.33x = 1,052,766.89
5. Step 5: Solve for x
   x = 1,052,766.89/870.33
6. Step 6: Final answer
   x = 1,209.62