Finding the Fourth Proportional to 13,196.40, 19,796.52 and 4,429.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.40 : 19,796.52 = 4,429.20 : x
2. Step 2: Convert to fraction form
   13,196.40/19,796.52 = 4,429.20/x
3. Step 3: Cross multiply
   13,196.40x = 19,796.52 × 4,429.20
4. Step 4: Simplify right side
   13,196.40x = 87,682,746.38
5. Step 5: Solve for x
   x = 87,682,746.38/13,196.40
6. Step 6: Final answer
   x = 6,644.44