Finding the Fourth Proportional to 1,218.80, 1,681.98 and 694.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,218.80 : 1,681.98 = 694.82 : x
2. Step 2: Convert to fraction form
   1,218.80/1,681.98 = 694.82/x
3. Step 3: Cross multiply
   1,218.80x = 1,681.98 × 694.82
4. Step 4: Simplify right side
   1,218.80x = 1,168,673.34
5. Step 5: Solve for x
   x = 1,168,673.34/1,218.80
6. Step 6: Final answer
   x = 958.87