Finding the Fourth Proportional to 31,669.71, 43,685.42 and 19,730.71

Step by Step Solution

1. Step 1: Write the proportion equation
   31,669.71 : 43,685.42 = 19,730.71 : x
2. Step 2: Convert to fraction form
   31,669.71/43,685.42 = 19,730.71/x
3. Step 3: Cross multiply
   31,669.71x = 43,685.42 × 19,730.71
4. Step 4: Simplify right side
   31,669.71x = 861,944,353.25
5. Step 5: Solve for x
   x = 861,944,353.25/31,669.71
6. Step 6: Final answer
   x = 27,216.68