Finding the Fourth Proportional to 12,906.72, 17,811.99 and 9,714.29

Step by Step Solution

1. Step 1: Write the proportion equation
   12,906.72 : 17,811.99 = 9,714.29 : x
2. Step 2: Convert to fraction form
   12,906.72/17,811.99 = 9,714.29/x
3. Step 3: Cross multiply
   12,906.72x = 17,811.99 × 9,714.29
4. Step 4: Simplify right side
   12,906.72x = 173,030,747.28
5. Step 5: Solve for x
   x = 173,030,747.28/12,906.72
6. Step 6: Final answer
   x = 13,406.25