Finding the Fourth Proportional to 13,172.67, 18,196.04 and 10,538.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,172.67 : 18,196.04 = 10,538.91 : x
2. Step 2: Convert to fraction form
   13,172.67/18,196.04 = 10,538.91/x
3. Step 3: Cross multiply
   13,172.67x = 18,196.04 × 10,538.91
4. Step 4: Simplify right side
   13,172.67x = 191,766,375.22
5. Step 5: Solve for x
   x = 191,766,375.22/13,172.67
6. Step 6: Final answer
   x = 14,557.90