Finding the Fourth Proportional to 25,139.38, 37,708.48 and 12,656.05

Step by Step Solution

1. Step 1: Write the proportion equation
   25,139.38 : 37,708.48 = 12,656.05 : x
2. Step 2: Convert to fraction form
   25,139.38/37,708.48 = 12,656.05/x
3. Step 3: Cross multiply
   25,139.38x = 37,708.48 × 12,656.05
4. Step 4: Simplify right side
   25,139.38x = 477,240,156.48
5. Step 5: Solve for x
   x = 477,240,156.48/25,139.38
6. Step 6: Final answer
   x = 18,983.77