Finding the Fourth Proportional to 3,123.09, 4,684.55 and 814.59

Step by Step Solution

1. Step 1: Write the proportion equation
   3,123.09 : 4,684.55 = 814.59 : x
2. Step 2: Convert to fraction form
   3,123.09/4,684.55 = 814.59/x
3. Step 3: Cross multiply
   3,123.09x = 4,684.55 × 814.59
4. Step 4: Simplify right side
   3,123.09x = 3,815,983.51
5. Step 5: Solve for x
   x = 3,815,983.51/3,123.09
6. Step 6: Final answer
   x = 1,221.86