Finding the Fourth Proportional to 31,135.50, 42,967 and 19,957.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,135.50 : 42,967 = 19,957.50 : x
2. Step 2: Convert to fraction form
   31,135.50/42,967 = 19,957.50/x
3. Step 3: Cross multiply
   31,135.50x = 42,967 × 19,957.50
4. Step 4: Simplify right side
   31,135.50x = 857,513,902.50
5. Step 5: Solve for x
   x = 857,513,902.50/31,135.50
6. Step 6: Final answer
   x = 27,541.36