Finding the Fourth Proportional to 13,196.49, 19,797.61 and 4,431.17

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.49 : 19,797.61 = 4,431.17 : x
2. Step 2: Convert to fraction form
   13,196.49/19,797.61 = 4,431.17/x
3. Step 3: Cross multiply
   13,196.49x = 19,797.61 × 4,431.17
4. Step 4: Simplify right side
   13,196.49x = 87,726,575.50
5. Step 5: Solve for x
   x = 87,726,575.50/13,196.49
6. Step 6: Final answer
   x = 6,647.72