Finding the Fourth Proportional to 1,109.01, 1,664.20 and 800.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.01 : 1,664.20 = 800.09 : x
2. Step 2: Convert to fraction form
   1,109.01/1,664.20 = 800.09/x
3. Step 3: Cross multiply
   1,109.01x = 1,664.20 × 800.09
4. Step 4: Simplify right side
   1,109.01x = 1,331,513.56
5. Step 5: Solve for x
   x = 1,331,513.56/1,109.01
6. Step 6: Final answer
   x = 1,200.63