Finding the Fourth Proportional to 872.78, 1,199.31 and 697.82

Step by Step Solution

1. Step 1: Write the proportion equation
   872.78 : 1,199.31 = 697.82 : x
2. Step 2: Convert to fraction form
   872.78/1,199.31 = 697.82/x
3. Step 3: Cross multiply
   872.78x = 1,199.31 × 697.82
4. Step 4: Simplify right side
   872.78x = 836,902.50
5. Step 5: Solve for x
   x = 836,902.50/872.78
6. Step 6: Final answer
   x = 958.89