Finding the Fourth Proportional to 25,920.05, 35,770.82 and 15,309.72

Step by Step Solution

1. Step 1: Write the proportion equation
   25,920.05 : 35,770.82 = 15,309.72 : x
2. Step 2: Convert to fraction form
   25,920.05/35,770.82 = 15,309.72/x
3. Step 3: Cross multiply
   25,920.05x = 35,770.82 × 15,309.72
4. Step 4: Simplify right side
   25,920.05x = 547,641,161.82
5. Step 5: Solve for x
   x = 547,641,161.82/25,920.05
6. Step 6: Final answer
   x = 21,128.09