Finding the Fourth Proportional to 31,128.29, 42,944.81 and 19,170.87

Step by Step Solution

1. Step 1: Write the proportion equation
   31,128.29 : 42,944.81 = 19,170.87 : x
2. Step 2: Convert to fraction form
   31,128.29/42,944.81 = 19,170.87/x
3. Step 3: Cross multiply
   31,128.29x = 42,944.81 × 19,170.87
4. Step 4: Simplify right side
   31,128.29x = 823,289,273.83
5. Step 5: Solve for x
   x = 823,289,273.83/31,128.29
6. Step 6: Final answer
   x = 26,448.27