Finding the Fourth Proportional to 1,216.50, 1,678.74 and 692.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.50 : 1,678.74 = 692.46 : x
2. Step 2: Convert to fraction form
   1,216.50/1,678.74 = 692.46/x
3. Step 3: Cross multiply
   1,216.50x = 1,678.74 × 692.46
4. Step 4: Simplify right side
   1,216.50x = 1,162,460.30
5. Step 5: Solve for x
   x = 1,162,460.30/1,216.50
6. Step 6: Final answer
   x = 955.58