Finding the Fourth Proportional to 25,807.20, 38,676.72 and 13,326.72

Step by Step Solution

1. Step 1: Write the proportion equation
   25,807.20 : 38,676.72 = 13,326.72 : x
2. Step 2: Convert to fraction form
   25,807.20/38,676.72 = 13,326.72/x
3. Step 3: Cross multiply
   25,807.20x = 38,676.72 × 13,326.72
4. Step 4: Simplify right side
   25,807.20x = 515,433,817.96
5. Step 5: Solve for x
   x = 515,433,817.96/25,807.20
6. Step 6: Final answer
   x = 19,972.48