Finding the Fourth Proportional to 31,118.18, 42,942.57 and 16,970.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,118.18 : 42,942.57 = 16,970.18 : x
2. Step 2: Convert to fraction form
   31,118.18/42,942.57 = 16,970.18/x
3. Step 3: Cross multiply
   31,118.18x = 42,942.57 × 16,970.18
4. Step 4: Simplify right side
   31,118.18x = 728,743,142.56
5. Step 5: Solve for x
   x = 728,743,142.56/31,118.18
6. Step 6: Final answer
   x = 23,418.57