Finding the Fourth Proportional to 1,206.89, 1,664.71 and 957.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,206.89 : 1,664.71 = 957.81 : x
2. Step 2: Convert to fraction form
   1,206.89/1,664.71 = 957.81/x
3. Step 3: Cross multiply
   1,206.89x = 1,664.71 × 957.81
4. Step 4: Simplify right side
   1,206.89x = 1,594,475.89
5. Step 5: Solve for x
   x = 1,594,475.89/1,206.89
6. Step 6: Final answer
   x = 1,321.14