Finding the Fourth Proportional to 1,789.80, 2,682.50 and 853.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,789.80 : 2,682.50 = 853.23 : x
2. Step 2: Convert to fraction form
   1,789.80/2,682.50 = 853.23/x
3. Step 3: Cross multiply
   1,789.80x = 2,682.50 × 853.23
4. Step 4: Simplify right side
   1,789.80x = 2,288,795.27
5. Step 5: Solve for x
   x = 2,288,795.27/1,789.80
6. Step 6: Final answer
   x = 1,278.80