Finding the Fourth Proportional to 13,196.97, 19,799.55 and 5,406.39

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.97 : 19,799.55 = 5,406.39 : x
2. Step 2: Convert to fraction form
   13,196.97/19,799.55 = 5,406.39/x
3. Step 3: Cross multiply
   13,196.97x = 19,799.55 × 5,406.39
4. Step 4: Simplify right side
   13,196.97x = 107,044,089.12
5. Step 5: Solve for x
   x = 107,044,089.12/13,196.97
6. Step 6: Final answer
   x = 8,111.26