Finding the Fourth Proportional to 1,288.02, 1,777.47 and 698.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.02 : 1,777.47 = 698.55 : x
2. Step 2: Convert to fraction form
   1,288.02/1,777.47 = 698.55/x
3. Step 3: Cross multiply
   1,288.02x = 1,777.47 × 698.55
4. Step 4: Simplify right side
   1,288.02x = 1,241,651.67
5. Step 5: Solve for x
   x = 1,241,651.67/1,288.02
6. Step 6: Final answer
   x = 964.00