Finding the Fourth Proportional to 22,812.16, 31,473.39 and 12,739

Step by Step Solution

1. Step 1: Write the proportion equation
   22,812.16 : 31,473.39 = 12,739 : x
2. Step 2: Convert to fraction form
   22,812.16/31,473.39 = 12,739/x
3. Step 3: Cross multiply
   22,812.16x = 31,473.39 × 12,739
4. Step 4: Simplify right side
   22,812.16x = 400,939,515.21
5. Step 5: Solve for x
   x = 400,939,515.21/22,812.16
6. Step 6: Final answer
   x = 17,575.69