Finding the Fourth Proportional to 1,239.91, 1,710.72 and 797.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,239.91 : 1,710.72 = 797.95 : x
2. Step 2: Convert to fraction form
   1,239.91/1,710.72 = 797.95/x
3. Step 3: Cross multiply
   1,239.91x = 1,710.72 × 797.95
4. Step 4: Simplify right side
   1,239.91x = 1,365,071.16
5. Step 5: Solve for x
   x = 1,365,071.16/1,239.91
6. Step 6: Final answer
   x = 1,100.95