Finding the Fourth Proportional to 31,116.88, 42,940.36 and 16,970

Step by Step Solution

1. Step 1: Write the proportion equation
   31,116.88 : 42,940.36 = 16,970 : x
2. Step 2: Convert to fraction form
   31,116.88/42,940.36 = 16,970/x
3. Step 3: Cross multiply
   31,116.88x = 42,940.36 × 16,970
4. Step 4: Simplify right side
   31,116.88x = 728,697,909.20
5. Step 5: Solve for x
   x = 728,697,909.20/31,116.88
6. Step 6: Final answer
   x = 23,418.09