Finding the Fourth Proportional to 23,181.66, 31,992.30 and 13,109.31

Step by Step Solution

1. Step 1: Write the proportion equation
   23,181.66 : 31,992.30 = 13,109.31 : x
2. Step 2: Convert to fraction form
   23,181.66/31,992.30 = 13,109.31/x
3. Step 3: Cross multiply
   23,181.66x = 31,992.30 × 13,109.31
4. Step 4: Simplify right side
   23,181.66x = 419,396,978.31
5. Step 5: Solve for x
   x = 419,396,978.31/23,181.66
6. Step 6: Final answer
   x = 18,091.76