Finding the Fourth Proportional to 13,357.72, 18,437.50 and 9,379.80

Step by Step Solution

1. Step 1: Write the proportion equation
   13,357.72 : 18,437.50 = 9,379.80 : x
2. Step 2: Convert to fraction form
   13,357.72/18,437.50 = 9,379.80/x
3. Step 3: Cross multiply
   13,357.72x = 18,437.50 × 9,379.80
4. Step 4: Simplify right side
   13,357.72x = 172,940,062.50
5. Step 5: Solve for x
   x = 172,940,062.50/13,357.72
6. Step 6: Final answer
   x = 12,946.82