Finding the Fourth Proportional to 1,321.77, 1,822.91 and 823.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.77 : 1,822.91 = 823.89 : x
2. Step 2: Convert to fraction form
   1,321.77/1,822.91 = 823.89/x
3. Step 3: Cross multiply
   1,321.77x = 1,822.91 × 823.89
4. Step 4: Simplify right side
   1,321.77x = 1,501,873.20
5. Step 5: Solve for x
   x = 1,501,873.20/1,321.77
6. Step 6: Final answer
   x = 1,136.26