Finding the Fourth Proportional to 31,107.88, 42,928.10 and 16,961

Step by Step Solution

1. Step 1: Write the proportion equation
   31,107.88 : 42,928.10 = 16,961 : x
2. Step 2: Convert to fraction form
   31,107.88/42,928.10 = 16,961/x
3. Step 3: Cross multiply
   31,107.88x = 42,928.10 × 16,961
4. Step 4: Simplify right side
   31,107.88x = 728,103,504.10
5. Step 5: Solve for x
   x = 728,103,504.10/31,107.88
6. Step 6: Final answer
   x = 23,405.76