Finding the Fourth Proportional to 13,238.50, 18,269.06 and 7,188.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,238.50 : 18,269.06 = 7,188.69 : x
2. Step 2: Convert to fraction form
   13,238.50/18,269.06 = 7,188.69/x
3. Step 3: Cross multiply
   13,238.50x = 18,269.06 × 7,188.69
4. Step 4: Simplify right side
   13,238.50x = 131,330,587.76
5. Step 5: Solve for x
   x = 131,330,587.76/13,238.50
6. Step 6: Final answer
   x = 9,920.35