Finding the Fourth Proportional to 31,126.89, 42,955.35 and 16,979.43

Step by Step Solution

1. Step 1: Write the proportion equation
   31,126.89 : 42,955.35 = 16,979.43 : x
2. Step 2: Convert to fraction form
   31,126.89/42,955.35 = 16,979.43/x
3. Step 3: Cross multiply
   31,126.89x = 42,955.35 × 16,979.43
4. Step 4: Simplify right side
   31,126.89x = 729,357,358.45
5. Step 5: Solve for x
   x = 729,357,358.45/31,126.89
6. Step 6: Final answer
   x = 23,431.75