Finding the Fourth Proportional to 23,181.72, 31,989.45 and 13,620.12

Step by Step Solution

1. Step 1: Write the proportion equation
   23,181.72 : 31,989.45 = 13,620.12 : x
2. Step 2: Convert to fraction form
   23,181.72/31,989.45 = 13,620.12/x
3. Step 3: Cross multiply
   23,181.72x = 31,989.45 × 13,620.12
4. Step 4: Simplify right side
   23,181.72x = 435,700,147.73
5. Step 5: Solve for x
   x = 435,700,147.73/23,181.72
6. Step 6: Final answer
   x = 18,794.99