Finding the Fourth Proportional to 1,311.30, 1,966.38 and 617.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.30 : 1,966.38 = 617.82 : x
2. Step 2: Convert to fraction form
   1,311.30/1,966.38 = 617.82/x
3. Step 3: Cross multiply
   1,311.30x = 1,966.38 × 617.82
4. Step 4: Simplify right side
   1,311.30x = 1,214,868.89
5. Step 5: Solve for x
   x = 1,214,868.89/1,311.30
6. Step 6: Final answer
   x = 926.46