Finding the Fourth Proportional to 13,236.50, 18,266.37 and 7,647.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,236.50 : 18,266.37 = 7,647.50 : x
2. Step 2: Convert to fraction form
   13,236.50/18,266.37 = 7,647.50/x
3. Step 3: Cross multiply
   13,236.50x = 18,266.37 × 7,647.50
4. Step 4: Simplify right side
   13,236.50x = 139,692,064.58
5. Step 5: Solve for x
   x = 139,692,064.58/13,236.50
6. Step 6: Final answer
   x = 10,553.55