Finding the Fourth Proportional to 1,441.50, 1,989.63 and 820.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.50 : 1,989.63 = 820.86 : x
2. Step 2: Convert to fraction form
   1,441.50/1,989.63 = 820.86/x
3. Step 3: Cross multiply
   1,441.50x = 1,989.63 × 820.86
4. Step 4: Simplify right side
   1,441.50x = 1,633,207.68
5. Step 5: Solve for x
   x = 1,633,207.68/1,441.50
6. Step 6: Final answer
   x = 1,132.99