Finding the Fourth Proportional to 13,164.78, 18,167.64 and 7,196.40

Step by Step Solution

1. Step 1: Write the proportion equation
   13,164.78 : 18,167.64 = 7,196.40 : x
2. Step 2: Convert to fraction form
   13,164.78/18,167.64 = 7,196.40/x
3. Step 3: Cross multiply
   13,164.78x = 18,167.64 × 7,196.40
4. Step 4: Simplify right side
   13,164.78x = 130,741,604.50
5. Step 5: Solve for x
   x = 130,741,604.50/13,164.78
6. Step 6: Final answer
   x = 9,931.17