Finding the Fourth Proportional to 30,731.94, 42,410.31 and 18,162.90

Step by Step Solution

1. Step 1: Write the proportion equation
   30,731.94 : 42,410.31 = 18,162.90 : x
2. Step 2: Convert to fraction form
   30,731.94/42,410.31 = 18,162.90/x
3. Step 3: Cross multiply
   30,731.94x = 42,410.31 × 18,162.90
4. Step 4: Simplify right side
   30,731.94x = 770,294,219.50
5. Step 5: Solve for x
   x = 770,294,219.50/30,731.94
6. Step 6: Final answer
   x = 25,064.94