Finding the Fourth Proportional to 1,288.41, 1,778.00 and 698.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.41 : 1,778.00 = 698.94 : x
2. Step 2: Convert to fraction form
   1,288.41/1,778.00 = 698.94/x
3. Step 3: Cross multiply
   1,288.41x = 1,778.00 × 698.94
4. Step 4: Simplify right side
   1,288.41x = 1,242,711.83
5. Step 5: Solve for x
   x = 1,242,711.83/1,288.41
6. Step 6: Final answer
   x = 964.53