Finding the Fourth Proportional to 20,105.10, 30,136.05 and 7,620.30

Step by Step Solution

1. Step 1: Write the proportion equation
   20,105.10 : 30,136.05 = 7,620.30 : x
2. Step 2: Convert to fraction form
   20,105.10/30,136.05 = 7,620.30/x
3. Step 3: Cross multiply
   20,105.10x = 30,136.05 × 7,620.30
4. Step 4: Simplify right side
   20,105.10x = 229,645,741.82
5. Step 5: Solve for x
   x = 229,645,741.82/20,105.10
6. Step 6: Final answer
   x = 11,422.26