Finding the Fourth Proportional to 31,146.13, 42,975.09 and 19,811.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,146.13 : 42,975.09 = 19,811.50 : x
2. Step 2: Convert to fraction form
   31,146.13/42,975.09 = 19,811.50/x
3. Step 3: Cross multiply
   31,146.13x = 42,975.09 × 19,811.50
4. Step 4: Simplify right side
   31,146.13x = 851,400,995.54
5. Step 5: Solve for x
   x = 851,400,995.54/31,146.13
6. Step 6: Final answer
   x = 27,335.69