Finding the Fourth Proportional to 1,355.72, 1,871.13 and 796.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.72 : 1,871.13 = 796.21 : x
2. Step 2: Convert to fraction form
   1,355.72/1,871.13 = 796.21/x
3. Step 3: Cross multiply
   1,355.72x = 1,871.13 × 796.21
4. Step 4: Simplify right side
   1,355.72x = 1,489,803.06
5. Step 5: Solve for x
   x = 1,489,803.06/1,355.72
6. Step 6: Final answer
   x = 1,098.91