Finding the Fourth Proportional to 31,133.31, 43,010.81 and 20,403.69

Step by Step Solution

1. Step 1: Write the proportion equation
   31,133.31 : 43,010.81 = 20,403.69 : x
2. Step 2: Convert to fraction form
   31,133.31/43,010.81 = 20,403.69/x
3. Step 3: Cross multiply
   31,133.31x = 43,010.81 × 20,403.69
4. Step 4: Simplify right side
   31,133.31x = 877,579,233.89
5. Step 5: Solve for x
   x = 877,579,233.89/31,133.31
6. Step 6: Final answer
   x = 28,187.79