Finding the Fourth Proportional to 1,661.67, 2,293.94 and 1,287.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.67 : 2,293.94 = 1,287.81 : x
2. Step 2: Convert to fraction form
   1,661.67/2,293.94 = 1,287.81/x
3. Step 3: Cross multiply
   1,661.67x = 2,293.94 × 1,287.81
4. Step 4: Simplify right side
   1,661.67x = 2,954,152.43
5. Step 5: Solve for x
   x = 2,954,152.43/1,661.67
6. Step 6: Final answer
   x = 1,777.82