Finding the Fourth Proportional to 1,485.39, 2,049.76 and 822.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,485.39 : 2,049.76 = 822.21 : x
2. Step 2: Convert to fraction form
   1,485.39/2,049.76 = 822.21/x
3. Step 3: Cross multiply
   1,485.39x = 2,049.76 × 822.21
4. Step 4: Simplify right side
   1,485.39x = 1,685,333.17
5. Step 5: Solve for x
   x = 1,685,333.17/1,485.39
6. Step 6: Final answer
   x = 1,134.61