Finding the Fourth Proportional to 1,356.61, 1,871.79 and 797.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.61 : 1,871.79 = 797.10 : x
2. Step 2: Convert to fraction form
   1,356.61/1,871.79 = 797.10/x
3. Step 3: Cross multiply
   1,356.61x = 1,871.79 × 797.10
4. Step 4: Simplify right side
   1,356.61x = 1,492,003.81
5. Step 5: Solve for x
   x = 1,492,003.81/1,356.61
6. Step 6: Final answer
   x = 1,099.80