Finding the Fourth Proportional to 1,216.32, 1,680.56 and 969.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.32 : 1,680.56 = 969.48 : x
2. Step 2: Convert to fraction form
   1,216.32/1,680.56 = 969.48/x
3. Step 3: Cross multiply
   1,216.32x = 1,680.56 × 969.48
4. Step 4: Simplify right side
   1,216.32x = 1,629,269.31
5. Step 5: Solve for x
   x = 1,629,269.31/1,216.32
6. Step 6: Final answer
   x = 1,339.51