Finding the Fourth Proportional to 31,035.50, 42,821.52 and 18,289.20

Step by Step Solution

1. Step 1: Write the proportion equation
   31,035.50 : 42,821.52 = 18,289.20 : x
2. Step 2: Convert to fraction form
   31,035.50/42,821.52 = 18,289.20/x
3. Step 3: Cross multiply
   31,035.50x = 42,821.52 × 18,289.20
4. Step 4: Simplify right side
   31,035.50x = 783,171,343.58
5. Step 5: Solve for x
   x = 783,171,343.58/31,035.50
6. Step 6: Final answer
   x = 25,234.69