Finding the Fourth Proportional to 31,137.50, 42,969.76 and 19,959.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,137.50 : 42,969.76 = 19,959.50 : x
2. Step 2: Convert to fraction form
   31,137.50/42,969.76 = 19,959.50/x
3. Step 3: Cross multiply
   31,137.50x = 42,969.76 × 19,959.50
4. Step 4: Simplify right side
   31,137.50x = 857,654,924.72
5. Step 5: Solve for x
   x = 857,654,924.72/31,137.50
6. Step 6: Final answer
   x = 27,544.12