Finding the Fourth Proportional to 835.38, 1,247.82 and 820.01

Step by Step Solution

1. Step 1: Write the proportion equation
   835.38 : 1,247.82 = 820.01 : x
2. Step 2: Convert to fraction form
   835.38/1,247.82 = 820.01/x
3. Step 3: Cross multiply
   835.38x = 1,247.82 × 820.01
4. Step 4: Simplify right side
   835.38x = 1,023,222.52
5. Step 5: Solve for x
   x = 1,023,222.52/835.38
6. Step 6: Final answer
   x = 1,224.86