Finding the Fourth Proportional to 42,791.69, 64,168.81 and 20,308.81

Step by Step Solution

1. Step 1: Write the proportion equation
   42,791.69 : 64,168.81 = 20,308.81 : x
2. Step 2: Convert to fraction form
   42,791.69/64,168.81 = 20,308.81/x
3. Step 3: Cross multiply
   42,791.69x = 64,168.81 × 20,308.81
4. Step 4: Simplify right side
   42,791.69x = 1,303,192,170.22
5. Step 5: Solve for x
   x = 1,303,192,170.22/42,791.69
6. Step 6: Final answer
   x = 30,454.33