Finding the Fourth Proportional to 1,369.73, 1,890.23 and 780.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.73 : 1,890.23 = 780.27 : x
2. Step 2: Convert to fraction form
   1,369.73/1,890.23 = 780.27/x
3. Step 3: Cross multiply
   1,369.73x = 1,890.23 × 780.27
4. Step 4: Simplify right side
   1,369.73x = 1,474,885.86
5. Step 5: Solve for x
   x = 1,474,885.86/1,369.73
6. Step 6: Final answer
   x = 1,076.78