Finding the Fourth Proportional to 1,440.83, 1,988.24 and 811.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.83 : 1,988.24 = 811.32 : x
2. Step 2: Convert to fraction form
   1,440.83/1,988.24 = 811.32/x
3. Step 3: Cross multiply
   1,440.83x = 1,988.24 × 811.32
4. Step 4: Simplify right side
   1,440.83x = 1,613,094.82
5. Step 5: Solve for x
   x = 1,613,094.82/1,440.83
6. Step 6: Final answer
   x = 1,119.56