Finding the Fourth Proportional to 13,196.64, 19,796.88 and 4,429.68

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.64 : 19,796.88 = 4,429.68 : x
2. Step 2: Convert to fraction form
   13,196.64/19,796.88 = 4,429.68/x
3. Step 3: Cross multiply
   13,196.64x = 19,796.88 × 4,429.68
4. Step 4: Simplify right side
   13,196.64x = 87,693,843.40
5. Step 5: Solve for x
   x = 87,693,843.40/13,196.64
6. Step 6: Final answer
   x = 6,645.16