Finding the Fourth Proportional to 22,810.53, 31,478.22 and 12,739.15

Step by Step Solution

1. Step 1: Write the proportion equation
   22,810.53 : 31,478.22 = 12,739.15 : x
2. Step 2: Convert to fraction form
   22,810.53/31,478.22 = 12,739.15/x
3. Step 3: Cross multiply
   22,810.53x = 31,478.22 × 12,739.15
4. Step 4: Simplify right side
   22,810.53x = 401,005,687.62
5. Step 5: Solve for x
   x = 401,005,687.62/22,810.53
6. Step 6: Final answer
   x = 17,579.85