Finding the Fourth Proportional to 2,335.72, 3,223.30 and 1,287.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,335.72 : 3,223.30 = 1,287.79 : x
2. Step 2: Convert to fraction form
   2,335.72/3,223.30 = 1,287.79/x
3. Step 3: Cross multiply
   2,335.72x = 3,223.30 × 1,287.79
4. Step 4: Simplify right side
   2,335.72x = 4,150,933.51
5. Step 5: Solve for x
   x = 4,150,933.51/2,335.72
6. Step 6: Final answer
   x = 1,777.15