Finding the Fourth Proportional to 11,820.96, 17,682.12 and 8,310.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,820.96 : 17,682.12 = 8,310.72 : x
2. Step 2: Convert to fraction form
   11,820.96/17,682.12 = 8,310.72/x
3. Step 3: Cross multiply
   11,820.96x = 17,682.12 × 8,310.72
4. Step 4: Simplify right side
   11,820.96x = 146,951,148.33
5. Step 5: Solve for x
   x = 146,951,148.33/11,820.96
6. Step 6: Final answer
   x = 12,431.41