Finding the Fourth Proportional to 1,356.78, 1,872.09 and 797.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.78 : 1,872.09 = 797.07 : x
2. Step 2: Convert to fraction form
   1,356.78/1,872.09 = 797.07/x
3. Step 3: Cross multiply
   1,356.78x = 1,872.09 × 797.07
4. Step 4: Simplify right side
   1,356.78x = 1,492,186.78
5. Step 5: Solve for x
   x = 1,492,186.78/1,356.78
6. Step 6: Final answer
   x = 1,099.80