Finding the Fourth Proportional to 1,216.52, 1,678.59 and 692.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.52 : 1,678.59 = 692.45 : x
2. Step 2: Convert to fraction form
   1,216.52/1,678.59 = 692.45/x
3. Step 3: Cross multiply
   1,216.52x = 1,678.59 × 692.45
4. Step 4: Simplify right side
   1,216.52x = 1,162,339.65
5. Step 5: Solve for x
   x = 1,162,339.65/1,216.52
6. Step 6: Final answer
   x = 955.46