Finding the Fourth Proportional to 1,441.36, 1,988.76 and 820.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.36 : 1,988.76 = 820.32 : x
2. Step 2: Convert to fraction form
   1,441.36/1,988.76 = 820.32/x
3. Step 3: Cross multiply
   1,441.36x = 1,988.76 × 820.32
4. Step 4: Simplify right side
   1,441.36x = 1,631,419.60
5. Step 5: Solve for x
   x = 1,631,419.60/1,441.36
6. Step 6: Final answer
   x = 1,131.86