Finding the Fourth Proportional to 1,217.82, 1,680.56 and 693.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,217.82 : 1,680.56 = 693.84 : x
2. Step 2: Convert to fraction form
   1,217.82/1,680.56 = 693.84/x
3. Step 3: Cross multiply
   1,217.82x = 1,680.56 × 693.84
4. Step 4: Simplify right side
   1,217.82x = 1,166,039.75
5. Step 5: Solve for x
   x = 1,166,039.75/1,217.82
6. Step 6: Final answer
   x = 957.48