Finding the Fourth Proportional to 13,167.72, 18,171.10 and 7,790.43

Step by Step Solution

1. Step 1: Write the proportion equation
   13,167.72 : 18,171.10 = 7,790.43 : x
2. Step 2: Convert to fraction form
   13,167.72/18,171.10 = 7,790.43/x
3. Step 3: Cross multiply
   13,167.72x = 18,171.10 × 7,790.43
4. Step 4: Simplify right side
   13,167.72x = 141,560,715.02
5. Step 5: Solve for x
   x = 141,560,715.02/13,167.72
6. Step 6: Final answer
   x = 10,750.59