Finding the Fourth Proportional to 13,399.37, 20,100.67 and 7,165.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,399.37 : 20,100.67 = 7,165.61 : x
2. Step 2: Convert to fraction form
   13,399.37/20,100.67 = 7,165.61/x
3. Step 3: Cross multiply
   13,399.37x = 20,100.67 × 7,165.61
4. Step 4: Simplify right side
   13,399.37x = 144,033,561.96
5. Step 5: Solve for x
   x = 144,033,561.96/13,399.37
6. Step 6: Final answer
   x = 10,749.28