Finding the Fourth Proportional to 1,441.04, 1,988.61 and 811.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.04 : 1,988.61 = 811.55 : x
2. Step 2: Convert to fraction form
   1,441.04/1,988.61 = 811.55/x
3. Step 3: Cross multiply
   1,441.04x = 1,988.61 × 811.55
4. Step 4: Simplify right side
   1,441.04x = 1,613,846.50
5. Step 5: Solve for x
   x = 1,613,846.50/1,441.04
6. Step 6: Final answer
   x = 1,119.92