Finding the Fourth Proportional to 1,216.89, 1,679.36 and 692.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.89 : 1,679.36 = 692.82 : x
2. Step 2: Convert to fraction form
   1,216.89/1,679.36 = 692.82/x
3. Step 3: Cross multiply
   1,216.89x = 1,679.36 × 692.82
4. Step 4: Simplify right side
   1,216.89x = 1,163,490.73
5. Step 5: Solve for x
   x = 1,163,490.73/1,216.89
6. Step 6: Final answer
   x = 956.12