Finding the Fourth Proportional to 25,648.72, 38,479.56 and 7,878.88

Step by Step Solution

1. Step 1: Write the proportion equation
   25,648.72 : 38,479.56 = 7,878.88 : x
2. Step 2: Convert to fraction form
   25,648.72/38,479.56 = 7,878.88/x
3. Step 3: Cross multiply
   25,648.72x = 38,479.56 × 7,878.88
4. Step 4: Simplify right side
   25,648.72x = 303,175,835.69
5. Step 5: Solve for x
   x = 303,175,835.69/25,648.72
6. Step 6: Final answer
   x = 11,820.31