Finding the Fourth Proportional to 13,196.68, 18,211 and 7,888.36

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.68 : 18,211 = 7,888.36 : x
2. Step 2: Convert to fraction form
   13,196.68/18,211 = 7,888.36/x
3. Step 3: Cross multiply
   13,196.68x = 18,211 × 7,888.36
4. Step 4: Simplify right side
   13,196.68x = 143,654,923.96
5. Step 5: Solve for x
   x = 143,654,923.96/13,196.68
6. Step 6: Final answer
   x = 10,885.69