Finding the Fourth Proportional to 2,335.31, 3,222.62 and 1,287.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,335.31 : 3,222.62 = 1,287.35 : x
2. Step 2: Convert to fraction form
   2,335.31/3,222.62 = 1,287.35/x
3. Step 3: Cross multiply
   2,335.31x = 3,222.62 × 1,287.35
4. Step 4: Simplify right side
   2,335.31x = 4,148,633.42
5. Step 5: Solve for x
   x = 4,148,633.42/2,335.31
6. Step 6: Final answer
   x = 1,776.48