Finding the Fourth Proportional to 22,020.05, 30,389.72 and 12,586.79

Step by Step Solution

1. Step 1: Write the proportion equation
   22,020.05 : 30,389.72 = 12,586.79 : x
2. Step 2: Convert to fraction form
   22,020.05/30,389.72 = 12,586.79/x
3. Step 3: Cross multiply
   22,020.05x = 30,389.72 × 12,586.79
4. Step 4: Simplify right side
   22,020.05x = 382,509,036.84
5. Step 5: Solve for x
   x = 382,509,036.84/22,020.05
6. Step 6: Final answer
   x = 17,370.94