Finding the Fourth Proportional to 1,288.74, 1,778.46 and 699.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.74 : 1,778.46 = 699.27 : x
2. Step 2: Convert to fraction form
   1,288.74/1,778.46 = 699.27/x
3. Step 3: Cross multiply
   1,288.74x = 1,778.46 × 699.27
4. Step 4: Simplify right side
   1,288.74x = 1,243,623.72
5. Step 5: Solve for x
   x = 1,243,623.72/1,288.74
6. Step 6: Final answer
   x = 964.99