Finding the Fourth Proportional to 31,128.48, 42,943.40 and 19,187.46

Step by Step Solution

1. Step 1: Write the proportion equation
   31,128.48 : 42,943.40 = 19,187.46 : x
2. Step 2: Convert to fraction form
   31,128.48/42,943.40 = 19,187.46/x
3. Step 3: Cross multiply
   31,128.48x = 42,943.40 × 19,187.46
4. Step 4: Simplify right side
   31,128.48x = 823,974,673.83
5. Step 5: Solve for x
   x = 823,974,673.83/31,128.48
6. Step 6: Final answer
   x = 26,470.12