Finding the Fourth Proportional to 1,352.72, 1,866.87 and 821.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,352.72 : 1,866.87 = 821.48 : x
2. Step 2: Convert to fraction form
   1,352.72/1,866.87 = 821.48/x
3. Step 3: Cross multiply
   1,352.72x = 1,866.87 × 821.48
4. Step 4: Simplify right side
   1,352.72x = 1,533,587.03
5. Step 5: Solve for x
   x = 1,533,587.03/1,352.72
6. Step 6: Final answer
   x = 1,133.71