Finding the Fourth Proportional to 22,978.36, 31,710 and 12,906.82

Step by Step Solution

1. Step 1: Write the proportion equation
   22,978.36 : 31,710 = 12,906.82 : x
2. Step 2: Convert to fraction form
   22,978.36/31,710 = 12,906.82/x
3. Step 3: Cross multiply
   22,978.36x = 31,710 × 12,906.82
4. Step 4: Simplify right side
   22,978.36x = 409,275,262.20
5. Step 5: Solve for x
   x = 409,275,262.20/22,978.36
6. Step 6: Final answer
   x = 17,811.33