Finding the Fourth Proportional to 12,645.72, 17,447.70 and 8,167.84

Step by Step Solution

1. Step 1: Write the proportion equation
   12,645.72 : 17,447.70 = 8,167.84 : x
2. Step 2: Convert to fraction form
   12,645.72/17,447.70 = 8,167.84/x
3. Step 3: Cross multiply
   12,645.72x = 17,447.70 × 8,167.84
4. Step 4: Simplify right side
   12,645.72x = 142,510,008.98
5. Step 5: Solve for x
   x = 142,510,008.98/12,645.72
6. Step 6: Final answer
   x = 11,269.43