Finding the Fourth Proportional to 9,196.32, 12,689.88 and 5,216.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,196.32 : 12,689.88 = 5,216.40 : x
2. Step 2: Convert to fraction form
   9,196.32/12,689.88 = 5,216.40/x
3. Step 3: Cross multiply
   9,196.32x = 12,689.88 × 5,216.40
4. Step 4: Simplify right side
   9,196.32x = 66,195,490.03
5. Step 5: Solve for x
   x = 66,195,490.03/9,196.32
6. Step 6: Final answer
   x = 7,198.04