Finding the Fourth Proportional to 15,878.15, 21,910.27 and 9,165.94

Step by Step Solution

1. Step 1: Write the proportion equation
   15,878.15 : 21,910.27 = 9,165.94 : x
2. Step 2: Convert to fraction form
   15,878.15/21,910.27 = 9,165.94/x
3. Step 3: Cross multiply
   15,878.15x = 21,910.27 × 9,165.94
4. Step 4: Simplify right side
   15,878.15x = 200,828,115.90
5. Step 5: Solve for x
   x = 200,828,115.90/15,878.15
6. Step 6: Final answer
   x = 12,648.08