Finding the Fourth Proportional to 1,217.22, 1,679.83 and 693.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,217.22 : 1,679.83 = 693.15 : x
2. Step 2: Convert to fraction form
   1,217.22/1,679.83 = 693.15/x
3. Step 3: Cross multiply
   1,217.22x = 1,679.83 × 693.15
4. Step 4: Simplify right side
   1,217.22x = 1,164,374.16
5. Step 5: Solve for x
   x = 1,164,374.16/1,217.22
6. Step 6: Final answer
   x = 956.58