Finding the Fourth Proportional to 1,218.74, 1,681.89 and 694.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,218.74 : 1,681.89 = 694.82 : x
2. Step 2: Convert to fraction form
   1,218.74/1,681.89 = 694.82/x
3. Step 3: Cross multiply
   1,218.74x = 1,681.89 × 694.82
4. Step 4: Simplify right side
   1,218.74x = 1,168,610.81
5. Step 5: Solve for x
   x = 1,168,610.81/1,218.74
6. Step 6: Final answer
   x = 958.87