Finding the Fourth Proportional to 1,440.83, 1,988.27 and 811.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.83 : 1,988.27 = 811.46 : x
2. Step 2: Convert to fraction form
   1,440.83/1,988.27 = 811.46/x
3. Step 3: Cross multiply
   1,440.83x = 1,988.27 × 811.46
4. Step 4: Simplify right side
   1,440.83x = 1,613,387.58
5. Step 5: Solve for x
   x = 1,613,387.58/1,440.83
6. Step 6: Final answer
   x = 1,119.77