Finding the Fourth Proportional to 1,404.53, 2,108.36 and 820.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.53 : 2,108.36 = 820.22 : x
2. Step 2: Convert to fraction form
   1,404.53/2,108.36 = 820.22/x
3. Step 3: Cross multiply
   1,404.53x = 2,108.36 × 820.22
4. Step 4: Simplify right side
   1,404.53x = 1,729,304.40
5. Step 5: Solve for x
   x = 1,729,304.40/1,404.53
6. Step 6: Final answer
   x = 1,231.24