Finding the Fourth Proportional to 31,108.54, 42,933.50 and 19,640.12

Step by Step Solution

1. Step 1: Write the proportion equation
   31,108.54 : 42,933.50 = 19,640.12 : x
2. Step 2: Convert to fraction form
   31,108.54/42,933.50 = 19,640.12/x
3. Step 3: Cross multiply
   31,108.54x = 42,933.50 × 19,640.12
4. Step 4: Simplify right side
   31,108.54x = 843,219,092.02
5. Step 5: Solve for x
   x = 843,219,092.02/31,108.54
6. Step 6: Final answer
   x = 27,105.71