Finding the Fourth Proportional to 20,622.06, 30,889.89 and 13,188.69

Step by Step Solution

1. Step 1: Write the proportion equation
   20,622.06 : 30,889.89 = 13,188.69 : x
2. Step 2: Convert to fraction form
   20,622.06/30,889.89 = 13,188.69/x
3. Step 3: Cross multiply
   20,622.06x = 30,889.89 × 13,188.69
4. Step 4: Simplify right side
   20,622.06x = 407,397,183.34
5. Step 5: Solve for x
   x = 407,397,183.34/20,622.06
6. Step 6: Final answer
   x = 19,755.41