Finding the Fourth Proportional to 31,386.72, 43,315.20 and 19,456.32

Step by Step Solution

1. Step 1: Write the proportion equation
   31,386.72 : 43,315.20 = 19,456.32 : x
2. Step 2: Convert to fraction form
   31,386.72/43,315.20 = 19,456.32/x
3. Step 3: Cross multiply
   31,386.72x = 43,315.20 × 19,456.32
4. Step 4: Simplify right side
   31,386.72x = 842,754,392.06
5. Step 5: Solve for x
   x = 842,754,392.06/31,386.72
6. Step 6: Final answer
   x = 26,850.67