Finding the Fourth Proportional to 1,287.30, 1,776.47 and 697.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.30 : 1,776.47 = 697.83 : x
2. Step 2: Convert to fraction form
   1,287.30/1,776.47 = 697.83/x
3. Step 3: Cross multiply
   1,287.30x = 1,776.47 × 697.83
4. Step 4: Simplify right side
   1,287.30x = 1,239,661.69
5. Step 5: Solve for x
   x = 1,239,661.69/1,287.30
6. Step 6: Final answer
   x = 963.00