Finding the Fourth Proportional to 31,126.74, 42,954.72 and 16,979.58

Step by Step Solution

1. Step 1: Write the proportion equation
   31,126.74 : 42,954.72 = 16,979.58 : x
2. Step 2: Convert to fraction form
   31,126.74/42,954.72 = 16,979.58/x
3. Step 3: Cross multiply
   31,126.74x = 42,954.72 × 16,979.58
4. Step 4: Simplify right side
   31,126.74x = 729,353,104.62
5. Step 5: Solve for x
   x = 729,353,104.62/31,126.74
6. Step 6: Final answer
   x = 23,431.72