Finding the Fourth Proportional to 28,661.31, 42,991.56 and 20,192.82

Step by Step Solution

1. Step 1: Write the proportion equation
   28,661.31 : 42,991.56 = 20,192.82 : x
2. Step 2: Convert to fraction form
   28,661.31/42,991.56 = 20,192.82/x
3. Step 3: Cross multiply
   28,661.31x = 42,991.56 × 20,192.82
4. Step 4: Simplify right side
   28,661.31x = 868,120,747.10
5. Step 5: Solve for x
   x = 868,120,747.10/28,661.31
6. Step 6: Final answer
   x = 30,288.94