Finding the Fourth Proportional to 1,485.45, 2,049.91 and 822.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,485.45 : 2,049.91 = 822.31 : x
2. Step 2: Convert to fraction form
   1,485.45/2,049.91 = 822.31/x
3. Step 3: Cross multiply
   1,485.45x = 2,049.91 × 822.31
4. Step 4: Simplify right side
   1,485.45x = 1,685,654.31
5. Step 5: Solve for x
   x = 1,685,654.31/1,485.45
6. Step 6: Final answer
   x = 1,134.78