Finding the Fourth Proportional to 31,058.56, 42,870.49 and 17,638.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,058.56 : 42,870.49 = 17,638.75 : x
2. Step 2: Convert to fraction form
   31,058.56/42,870.49 = 17,638.75/x
3. Step 3: Cross multiply
   31,058.56x = 42,870.49 × 17,638.75
4. Step 4: Simplify right side
   31,058.56x = 756,181,767.29
5. Step 5: Solve for x
   x = 756,181,767.29/31,058.56
6. Step 6: Final answer
   x = 24,346.97