Finding the Fourth Proportional to 22,810.50, 31,478.17 and 12,739.12

Step by Step Solution

1. Step 1: Write the proportion equation
   22,810.50 : 31,478.17 = 12,739.12 : x
2. Step 2: Convert to fraction form
   22,810.50/31,478.17 = 12,739.12/x
3. Step 3: Cross multiply
   22,810.50x = 31,478.17 × 12,739.12
4. Step 4: Simplify right side
   22,810.50x = 401,004,185.01
5. Step 5: Solve for x
   x = 401,004,185.01/22,810.50
6. Step 6: Final answer
   x = 17,579.81