Finding the Fourth Proportional to 13,216.50, 18,238.77 and 7,328.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,216.50 : 18,238.77 = 7,328.50 : x
2. Step 2: Convert to fraction form
   13,216.50/18,238.77 = 7,328.50/x
3. Step 3: Cross multiply
   13,216.50x = 18,238.77 × 7,328.50
4. Step 4: Simplify right side
   13,216.50x = 133,662,825.95
5. Step 5: Solve for x
   x = 133,662,825.95/13,216.50
6. Step 6: Final answer
   x = 10,113.33