Finding the Fourth Proportional to 15,479.78, 21,362.52 and 9,106.82

Step by Step Solution

1. Step 1: Write the proportion equation
   15,479.78 : 21,362.52 = 9,106.82 : x
2. Step 2: Convert to fraction form
   15,479.78/21,362.52 = 9,106.82/x
3. Step 3: Cross multiply
   15,479.78x = 21,362.52 × 9,106.82
4. Step 4: Simplify right side
   15,479.78x = 194,544,624.39
5. Step 5: Solve for x
   x = 194,544,624.39/15,479.78
6. Step 6: Final answer
   x = 12,567.66