Finding the Fourth Proportional to 1,216.33, 1,820.91 and 825.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.33 : 1,820.91 = 825.31 : x
2. Step 2: Convert to fraction form
   1,216.33/1,820.91 = 825.31/x
3. Step 3: Cross multiply
   1,216.33x = 1,820.91 × 825.31
4. Step 4: Simplify right side
   1,216.33x = 1,502,815.23
5. Step 5: Solve for x
   x = 1,502,815.23/1,216.33
6. Step 6: Final answer
   x = 1,235.53