Finding the Fourth Proportional to 31,939.31, 43,757.07 and 30,742.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,939.31 : 43,757.07 = 30,742.18 : x
2. Step 2: Convert to fraction form
   31,939.31/43,757.07 = 30,742.18/x
3. Step 3: Cross multiply
   31,939.31x = 43,757.07 × 30,742.18
4. Step 4: Simplify right side
   31,939.31x = 1,345,187,722.21
5. Step 5: Solve for x
   x = 1,345,187,722.21/31,939.31
6. Step 6: Final answer
   x = 42,116.99