Finding the Fourth Proportional to 25,142.20, 37,724.10 and 12,830.20

Step by Step Solution

1. Step 1: Write the proportion equation
   25,142.20 : 37,724.10 = 12,830.20 : x
2. Step 2: Convert to fraction form
   25,142.20/37,724.10 = 12,830.20/x
3. Step 3: Cross multiply
   25,142.20x = 37,724.10 × 12,830.20
4. Step 4: Simplify right side
   25,142.20x = 484,007,747.82
5. Step 5: Solve for x
   x = 484,007,747.82/25,142.20
6. Step 6: Final answer
   x = 19,250.81