Finding the Fourth Proportional to 1,480.31, 2,042.83 and 817.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,480.31 : 2,042.83 = 817.21 : x
2. Step 2: Convert to fraction form
   1,480.31/2,042.83 = 817.21/x
3. Step 3: Cross multiply
   1,480.31x = 2,042.83 × 817.21
4. Step 4: Simplify right side
   1,480.31x = 1,669,421.10
5. Step 5: Solve for x
   x = 1,669,421.10/1,480.31
6. Step 6: Final answer
   x = 1,127.75