Finding the Fourth Proportional to 1,223.29, 1,688.52 and 699.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,223.29 : 1,688.52 = 699.67 : x
2. Step 2: Convert to fraction form
   1,223.29/1,688.52 = 699.67/x
3. Step 3: Cross multiply
   1,223.29x = 1,688.52 × 699.67
4. Step 4: Simplify right side
   1,223.29x = 1,181,406.79
5. Step 5: Solve for x
   x = 1,181,406.79/1,223.29
6. Step 6: Final answer
   x = 965.76