Finding the Fourth Proportional to 22,190.16, 30,621 and 12,759.12

Step by Step Solution

1. Step 1: Write the proportion equation
   22,190.16 : 30,621 = 12,759.12 : x
2. Step 2: Convert to fraction form
   22,190.16/30,621 = 12,759.12/x
3. Step 3: Cross multiply
   22,190.16x = 30,621 × 12,759.12
4. Step 4: Simplify right side
   22,190.16x = 390,697,013.52
5. Step 5: Solve for x
   x = 390,697,013.52/22,190.16
6. Step 6: Final answer
   x = 17,606.77