Finding the Fourth Proportional to 31,129.31, 42,958.45 and 18,554.06

Step by Step Solution

1. Step 1: Write the proportion equation
   31,129.31 : 42,958.45 = 18,554.06 : x
2. Step 2: Convert to fraction form
   31,129.31/42,958.45 = 18,554.06/x
3. Step 3: Cross multiply
   31,129.31x = 42,958.45 × 18,554.06
4. Step 4: Simplify right side
   31,129.31x = 797,053,789.40
5. Step 5: Solve for x
   x = 797,053,789.40/31,129.31
6. Step 6: Final answer
   x = 25,604.61