Finding the Fourth Proportional to 1,216.82, 1,823.69 and 661.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.82 : 1,823.69 = 661.52 : x
2. Step 2: Convert to fraction form
   1,216.82/1,823.69 = 661.52/x
3. Step 3: Cross multiply
   1,216.82x = 1,823.69 × 661.52
4. Step 4: Simplify right side
   1,216.82x = 1,206,394.98
5. Step 5: Solve for x
   x = 1,206,394.98/1,216.82
6. Step 6: Final answer
   x = 991.44