Finding the Fourth Proportional to 22,991.05, 31,725.29 and 12,917.89

Step by Step Solution

1. Step 1: Write the proportion equation
   22,991.05 : 31,725.29 = 12,917.89 : x
2. Step 2: Convert to fraction form
   22,991.05/31,725.29 = 12,917.89/x
3. Step 3: Cross multiply
   22,991.05x = 31,725.29 × 12,917.89
4. Step 4: Simplify right side
   22,991.05x = 409,823,741.85
5. Step 5: Solve for x
   x = 409,823,741.85/22,991.05
6. Step 6: Final answer
   x = 17,825.36