Finding the Fourth Proportional to 1,273.75, 1,909.98 and 451.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,273.75 : 1,909.98 = 451.89 : x
2. Step 2: Convert to fraction form
   1,273.75/1,909.98 = 451.89/x
3. Step 3: Cross multiply
   1,273.75x = 1,909.98 × 451.89
4. Step 4: Simplify right side
   1,273.75x = 863,100.86
5. Step 5: Solve for x
   x = 863,100.86/1,273.75
6. Step 6: Final answer
   x = 677.61