Finding the Fourth Proportional to 20,081.81, 30,124.58 and 5,290.81

Step by Step Solution

1. Step 1: Write the proportion equation
   20,081.81 : 30,124.58 = 5,290.81 : x
2. Step 2: Convert to fraction form
   20,081.81/30,124.58 = 5,290.81/x
3. Step 3: Cross multiply
   20,081.81x = 30,124.58 × 5,290.81
4. Step 4: Simplify right side
   20,081.81x = 159,383,327.34
5. Step 5: Solve for x
   x = 159,383,327.34/20,081.81
6. Step 6: Final answer
   x = 7,936.70