Finding the Fourth Proportional to 1,493.40, 2,238.72 and 800.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,493.40 : 2,238.72 = 800.55 : x
2. Step 2: Convert to fraction form
   1,493.40/2,238.72 = 800.55/x
3. Step 3: Cross multiply
   1,493.40x = 2,238.72 × 800.55
4. Step 4: Simplify right side
   1,493.40x = 1,792,207.30
5. Step 5: Solve for x
   x = 1,792,207.30/1,493.40
6. Step 6: Final answer
   x = 1,200.09