Finding the Fourth Proportional to 1,441.12, 1,988.63 and 811.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.12 : 1,988.63 = 811.52 : x
2. Step 2: Convert to fraction form
   1,441.12/1,988.63 = 811.52/x
3. Step 3: Cross multiply
   1,441.12x = 1,988.63 × 811.52
4. Step 4: Simplify right side
   1,441.12x = 1,613,813.02
5. Step 5: Solve for x
   x = 1,613,813.02/1,441.12
6. Step 6: Final answer
   x = 1,119.83