Finding the Fourth Proportional to 20,609.02, 30,912.72 and 8,125.30

Step by Step Solution

1. Step 1: Write the proportion equation
   20,609.02 : 30,912.72 = 8,125.30 : x
2. Step 2: Convert to fraction form
   20,609.02/30,912.72 = 8,125.30/x
3. Step 3: Cross multiply
   20,609.02x = 30,912.72 × 8,125.30
4. Step 4: Simplify right side
   20,609.02x = 251,175,123.82
5. Step 5: Solve for x
   x = 251,175,123.82/20,609.02
6. Step 6: Final answer
   x = 12,187.63