Finding the Fourth Proportional to 2,335.34, 3,222.92 and 1,287.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,335.34 : 3,222.92 = 1,287.40 : x
2. Step 2: Convert to fraction form
   2,335.34/3,222.92 = 1,287.40/x
3. Step 3: Cross multiply
   2,335.34x = 3,222.92 × 1,287.40
4. Step 4: Simplify right side
   2,335.34x = 4,149,187.21
5. Step 5: Solve for x
   x = 4,149,187.21/2,335.34
6. Step 6: Final answer
   x = 1,776.70