Finding the Fourth Proportional to 1,217.82, 1,680.61 and 693.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,217.82 : 1,680.61 = 693.84 : x
2. Step 2: Convert to fraction form
   1,217.82/1,680.61 = 693.84/x
3. Step 3: Cross multiply
   1,217.82x = 1,680.61 × 693.84
4. Step 4: Simplify right side
   1,217.82x = 1,166,079.76
5. Step 5: Solve for x
   x = 1,166,079.76/1,217.82
6. Step 6: Final answer
   x = 957.51