Finding the Fourth Proportional to 25,131.20, 37,721.10 and 12,665.30

Step by Step Solution

1. Step 1: Write the proportion equation
   25,131.20 : 37,721.10 = 12,665.30 : x
2. Step 2: Convert to fraction form
   25,131.20/37,721.10 = 12,665.30/x
3. Step 3: Cross multiply
   25,131.20x = 37,721.10 × 12,665.30
4. Step 4: Simplify right side
   25,131.20x = 477,749,047.83
5. Step 5: Solve for x
   x = 477,749,047.83/25,131.20
6. Step 6: Final answer
   x = 19,010.20