Finding the Fourth Proportional to 1,274.94, 1,910.79 and 543.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,274.94 : 1,910.79 = 543.78 : x
2. Step 2: Convert to fraction form
   1,274.94/1,910.79 = 543.78/x
3. Step 3: Cross multiply
   1,274.94x = 1,910.79 × 543.78
4. Step 4: Simplify right side
   1,274.94x = 1,039,049.39
5. Step 5: Solve for x
   x = 1,039,049.39/1,274.94
6. Step 6: Final answer
   x = 814.98