Finding the Fourth Proportional to 1,173.91, 1,621.32 and 800.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,173.91 : 1,621.32 = 800.25 : x
2. Step 2: Convert to fraction form
   1,173.91/1,621.32 = 800.25/x
3. Step 3: Cross multiply
   1,173.91x = 1,621.32 × 800.25
4. Step 4: Simplify right side
   1,173.91x = 1,297,458.25
5. Step 5: Solve for x
   x = 1,297,458.25/1,173.91
6. Step 6: Final answer
   x = 1,105.25