Finding the Fourth Proportional to 1,485.05, 2,049.34 and 821.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,485.05 : 2,049.34 = 821.89 : x
2. Step 2: Convert to fraction form
   1,485.05/2,049.34 = 821.89/x
3. Step 3: Cross multiply
   1,485.05x = 2,049.34 × 821.89
4. Step 4: Simplify right side
   1,485.05x = 1,684,324.87
5. Step 5: Solve for x
   x = 1,684,324.87/1,485.05
6. Step 6: Final answer
   x = 1,134.19