Finding the Fourth Proportional to 1,216.37, 1,678.79 and 692.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.37 : 1,678.79 = 692.57 : x
2. Step 2: Convert to fraction form
   1,216.37/1,678.79 = 692.57/x
3. Step 3: Cross multiply
   1,216.37x = 1,678.79 × 692.57
4. Step 4: Simplify right side
   1,216.37x = 1,162,679.59
5. Step 5: Solve for x
   x = 1,162,679.59/1,216.37
6. Step 6: Final answer
   x = 955.86