Finding the Fourth Proportional to 23,185.21, 31,995.35 and 13,115.61

Step by Step Solution

1. Step 1: Write the proportion equation
   23,185.21 : 31,995.35 = 13,115.61 : x
2. Step 2: Convert to fraction form
   23,185.21/31,995.35 = 13,115.61/x
3. Step 3: Cross multiply
   23,185.21x = 31,995.35 × 13,115.61
4. Step 4: Simplify right side
   23,185.21x = 419,638,532.41
5. Step 5: Solve for x
   x = 419,638,532.41/23,185.21
6. Step 6: Final answer
   x = 18,099.41