Finding the Fourth Proportional to 22,979.34, 31,709.25 and 12,905.49

Step by Step Solution

1. Step 1: Write the proportion equation
   22,979.34 : 31,709.25 = 12,905.49 : x
2. Step 2: Convert to fraction form
   22,979.34/31,709.25 = 12,905.49/x
3. Step 3: Cross multiply
   22,979.34x = 31,709.25 × 12,905.49
4. Step 4: Simplify right side
   22,979.34x = 409,223,408.78
5. Step 5: Solve for x
   x = 409,223,408.78/22,979.34
6. Step 6: Final answer
   x = 17,808.32