Finding the Fourth Proportional to 2,335.61, 3,222.81 and 1,287.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,335.61 : 3,222.81 = 1,287.69 : x
2. Step 2: Convert to fraction form
   2,335.61/3,222.81 = 1,287.69/x
3. Step 3: Cross multiply
   2,335.61x = 3,222.81 × 1,287.69
4. Step 4: Simplify right side
   2,335.61x = 4,149,980.21
5. Step 5: Solve for x
   x = 4,149,980.21/2,335.61
6. Step 6: Final answer
   x = 1,776.83