Finding the Fourth Proportional to 1,272.78, 1,908.56 and 541.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272.78 : 1,908.56 = 541.96 : x
2. Step 2: Convert to fraction form
   1,272.78/1,908.56 = 541.96/x
3. Step 3: Cross multiply
   1,272.78x = 1,908.56 × 541.96
4. Step 4: Simplify right side
   1,272.78x = 1,034,359.76
5. Step 5: Solve for x
   x = 1,034,359.76/1,272.78
6. Step 6: Final answer
   x = 812.68