Finding the Fourth Proportional to 1,451.22, 2,002.55 and 821.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,451.22 : 2,002.55 = 821.79 : x
2. Step 2: Convert to fraction form
   1,451.22/2,002.55 = 821.79/x
3. Step 3: Cross multiply
   1,451.22x = 2,002.55 × 821.79
4. Step 4: Simplify right side
   1,451.22x = 1,645,671.46
5. Step 5: Solve for x
   x = 1,645,671.46/1,451.22
6. Step 6: Final answer
   x = 1,133.99