Finding the Fourth Proportional to 1,287.49, 1,776.72 and 698.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.49 : 1,776.72 = 698.03 : x
2. Step 2: Convert to fraction form
   1,287.49/1,776.72 = 698.03/x
3. Step 3: Cross multiply
   1,287.49x = 1,776.72 × 698.03
4. Step 4: Simplify right side
   1,287.49x = 1,240,194.98
5. Step 5: Solve for x
   x = 1,240,194.98/1,287.49
6. Step 6: Final answer
   x = 963.27