Finding the Fourth Proportional to 1,216.28, 1,678.37 and 692.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.28 : 1,678.37 = 692.25 : x
2. Step 2: Convert to fraction form
   1,216.28/1,678.37 = 692.25/x
3. Step 3: Cross multiply
   1,216.28x = 1,678.37 × 692.25
4. Step 4: Simplify right side
   1,216.28x = 1,161,848.17
5. Step 5: Solve for x
   x = 1,161,848.17/1,216.28
6. Step 6: Final answer
   x = 955.25