Finding the Fourth Proportional to 31,116.12, 42,940.56 and 16,969.28

Step by Step Solution

1. Step 1: Write the proportion equation
   31,116.12 : 42,940.56 = 16,969.28 : x
2. Step 2: Convert to fraction form
   31,116.12/42,940.56 = 16,969.28/x
3. Step 3: Cross multiply
   31,116.12x = 42,940.56 × 16,969.28
4. Step 4: Simplify right side
   31,116.12x = 728,670,386.00
5. Step 5: Solve for x
   x = 728,670,386.00/31,116.12
6. Step 6: Final answer
   x = 23,417.78