Finding the Fourth Proportional to 30,892.14, 42,638.79 and 20,296.14

Step by Step Solution

1. Step 1: Write the proportion equation
   30,892.14 : 42,638.79 = 20,296.14 : x
2. Step 2: Convert to fraction form
   30,892.14/42,638.79 = 20,296.14/x
3. Step 3: Cross multiply
   30,892.14x = 42,638.79 × 20,296.14
4. Step 4: Simplify right side
   30,892.14x = 865,402,851.27
5. Step 5: Solve for x
   x = 865,402,851.27/30,892.14
6. Step 6: Final answer
   x = 28,013.69