Finding the Fourth Proportional to 1,221.32, 1,685.38 and 697.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,221.32 : 1,685.38 = 697.34 : x
2. Step 2: Convert to fraction form
   1,221.32/1,685.38 = 697.34/x
3. Step 3: Cross multiply
   1,221.32x = 1,685.38 × 697.34
4. Step 4: Simplify right side
   1,221.32x = 1,175,282.89
5. Step 5: Solve for x
   x = 1,175,282.89/1,221.32
6. Step 6: Final answer
   x = 962.31