Finding the Fourth Proportional to 1,216.62, 1,681.56 and 954.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.62 : 1,681.56 = 954.18 : x
2. Step 2: Convert to fraction form
   1,216.62/1,681.56 = 954.18/x
3. Step 3: Cross multiply
   1,216.62x = 1,681.56 × 954.18
4. Step 4: Simplify right side
   1,216.62x = 1,604,510.92
5. Step 5: Solve for x
   x = 1,604,510.92/1,216.62
6. Step 6: Final answer
   x = 1,318.83