Finding the Fourth Proportional to 1,111.88, 1,668.15 and 800.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.88 : 1,668.15 = 800.23 : x
2. Step 2: Convert to fraction form
   1,111.88/1,668.15 = 800.23/x
3. Step 3: Cross multiply
   1,111.88x = 1,668.15 × 800.23
4. Step 4: Simplify right side
   1,111.88x = 1,334,901.50
5. Step 5: Solve for x
   x = 1,334,901.50/1,111.88
6. Step 6: Final answer
   x = 1,200.59