Finding the Fourth Proportional to 25,691.78, 38,514.30 and 9,886.72

Step by Step Solution

1. Step 1: Write the proportion equation
   25,691.78 : 38,514.30 = 9,886.72 : x
2. Step 2: Convert to fraction form
   25,691.78/38,514.30 = 9,886.72/x
3. Step 3: Cross multiply
   25,691.78x = 38,514.30 × 9,886.72
4. Step 4: Simplify right side
   25,691.78x = 380,780,100.10
5. Step 5: Solve for x
   x = 380,780,100.10/25,691.78
6. Step 6: Final answer
   x = 14,821.09