Finding the Fourth Proportional to 1,216.86, 1,679.58 and 693.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.86 : 1,679.58 = 693.06 : x
2. Step 2: Convert to fraction form
   1,216.86/1,679.58 = 693.06/x
3. Step 3: Cross multiply
   1,216.86x = 1,679.58 × 693.06
4. Step 4: Simplify right side
   1,216.86x = 1,164,049.71
5. Step 5: Solve for x
   x = 1,164,049.71/1,216.86
6. Step 6: Final answer
   x = 956.60