Finding the Fourth Proportional to 1,355.90, 1,871.16 and 796.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.90 : 1,871.16 = 796.79 : x
2. Step 2: Convert to fraction form
   1,355.90/1,871.16 = 796.79/x
3. Step 3: Cross multiply
   1,355.90x = 1,871.16 × 796.79
4. Step 4: Simplify right side
   1,355.90x = 1,490,921.58
5. Step 5: Solve for x
   x = 1,490,921.58/1,355.90
6. Step 6: Final answer
   x = 1,099.58