Finding the Fourth Proportional to 13,196.16, 19,807.20 and 9,917.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.16 : 19,807.20 = 9,917.28 : x
2. Step 2: Convert to fraction form
   13,196.16/19,807.20 = 9,917.28/x
3. Step 3: Cross multiply
   13,196.16x = 19,807.20 × 9,917.28
4. Step 4: Simplify right side
   13,196.16x = 196,433,548.42
5. Step 5: Solve for x
   x = 196,433,548.42/13,196.16
6. Step 6: Final answer
   x = 14,885.66