Finding the Fourth Proportional to 1,217.31, 1,680.03 and 693.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,217.31 : 1,680.03 = 693.42 : x
2. Step 2: Convert to fraction form
   1,217.31/1,680.03 = 693.42/x
3. Step 3: Cross multiply
   1,217.31x = 1,680.03 × 693.42
4. Step 4: Simplify right side
   1,217.31x = 1,164,966.40
5. Step 5: Solve for x
   x = 1,164,966.40/1,217.31
6. Step 6: Final answer
   x = 957.00