Finding the Fourth Proportional to 1,428.50, 2,144.55 and 1,234.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.50 : 2,144.55 = 1,234.73 : x
2. Step 2: Convert to fraction form
   1,428.50/2,144.55 = 1,234.73/x
3. Step 3: Cross multiply
   1,428.50x = 2,144.55 × 1,234.73
4. Step 4: Simplify right side
   1,428.50x = 2,647,940.22
5. Step 5: Solve for x
   x = 2,647,940.22/1,428.50
6. Step 6: Final answer
   x = 1,853.65