Finding the Fourth Proportional to 979.82, 1,476.47 and 810.30

Step by Step Solution

1. Step 1: Write the proportion equation
   979.82 : 1,476.47 = 810.30 : x
2. Step 2: Convert to fraction form
   979.82/1,476.47 = 810.30/x
3. Step 3: Cross multiply
   979.82x = 1,476.47 × 810.30
4. Step 4: Simplify right side
   979.82x = 1,196,387.89
5. Step 5: Solve for x
   x = 1,196,387.89/979.82
6. Step 6: Final answer
   x = 1,221.03