Finding the Fourth Proportional to 1,216.22, 1,678.52 and 692.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.22 : 1,678.52 = 692.35 : x
2. Step 2: Convert to fraction form
   1,216.22/1,678.52 = 692.35/x
3. Step 3: Cross multiply
   1,216.22x = 1,678.52 × 692.35
4. Step 4: Simplify right side
   1,216.22x = 1,162,120.86
5. Step 5: Solve for x
   x = 1,162,120.86/1,216.22
6. Step 6: Final answer
   x = 955.52