Finding the Fourth Proportional to 1,441.17, 1,988.99 and 811.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.17 : 1,988.99 = 811.72 : x
2. Step 2: Convert to fraction form
   1,441.17/1,988.99 = 811.72/x
3. Step 3: Cross multiply
   1,441.17x = 1,988.99 × 811.72
4. Step 4: Simplify right side
   1,441.17x = 1,614,502.96
5. Step 5: Solve for x
   x = 1,614,502.96/1,441.17
6. Step 6: Final answer
   x = 1,120.27