Finding the Fourth Proportional to 13,238.80, 18,269.61 and 7,189.06

Step by Step Solution

1. Step 1: Write the proportion equation
   13,238.80 : 18,269.61 = 7,189.06 : x
2. Step 2: Convert to fraction form
   13,238.80/18,269.61 = 7,189.06/x
3. Step 3: Cross multiply
   13,238.80x = 18,269.61 × 7,189.06
4. Step 4: Simplify right side
   13,238.80x = 131,341,322.47
5. Step 5: Solve for x
   x = 131,341,322.47/13,238.80
6. Step 6: Final answer
   x = 9,920.94