Finding the Fourth Proportional to 1,221.42, 1,685.58 and 697.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,221.42 : 1,685.58 = 697.46 : x
2. Step 2: Convert to fraction form
   1,221.42/1,685.58 = 697.46/x
3. Step 3: Cross multiply
   1,221.42x = 1,685.58 × 697.46
4. Step 4: Simplify right side
   1,221.42x = 1,175,616.20
5. Step 5: Solve for x
   x = 1,175,616.20/1,221.42
6. Step 6: Final answer
   x = 962.50