Finding the Fourth Proportional to 13,617.50, 18,791.21 and 7,649.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,617.50 : 18,791.21 = 7,649.72 : x
2. Step 2: Convert to fraction form
   13,617.50/18,791.21 = 7,649.72/x
3. Step 3: Cross multiply
   13,617.50x = 18,791.21 × 7,649.72
4. Step 4: Simplify right side
   13,617.50x = 143,747,362.76
5. Step 5: Solve for x
   x = 143,747,362.76/13,617.50
6. Step 6: Final answer
   x = 10,556.08