Finding the Fourth Proportional to 1,287.50, 1,776.74 and 698.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.50 : 1,776.74 = 698.03 : x
2. Step 2: Convert to fraction form
   1,287.50/1,776.74 = 698.03/x
3. Step 3: Cross multiply
   1,287.50x = 1,776.74 × 698.03
4. Step 4: Simplify right side
   1,287.50x = 1,240,210.68
5. Step 5: Solve for x
   x = 1,240,210.68/1,287.50
6. Step 6: Final answer
   x = 963.27