Finding the Fourth Proportional to 1,351.69, 1,865.25 and 820.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,351.69 : 1,865.25 = 820.69 : x
2. Step 2: Convert to fraction form
   1,351.69/1,865.25 = 820.69/x
3. Step 3: Cross multiply
   1,351.69x = 1,865.25 × 820.69
4. Step 4: Simplify right side
   1,351.69x = 1,530,792.02
5. Step 5: Solve for x
   x = 1,530,792.02/1,351.69
6. Step 6: Final answer
   x = 1,132.50