Finding the Fourth Proportional to 1,272.78, 1,756.54 and 713.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272.78 : 1,756.54 = 713.38 : x
2. Step 2: Convert to fraction form
   1,272.78/1,756.54 = 713.38/x
3. Step 3: Cross multiply
   1,272.78x = 1,756.54 × 713.38
4. Step 4: Simplify right side
   1,272.78x = 1,253,071.72
5. Step 5: Solve for x
   x = 1,253,071.72/1,272.78
6. Step 6: Final answer
   x = 984.52