Finding the Fourth Proportional to 30,771.02, 42,452.55 and 20,683.48

Step by Step Solution

1. Step 1: Write the proportion equation
   30,771.02 : 42,452.55 = 20,683.48 : x
2. Step 2: Convert to fraction form
   30,771.02/42,452.55 = 20,683.48/x
3. Step 3: Cross multiply
   30,771.02x = 42,452.55 × 20,683.48
4. Step 4: Simplify right side
   30,771.02x = 878,066,259.33
5. Step 5: Solve for x
   x = 878,066,259.33/30,771.02
6. Step 6: Final answer
   x = 28,535.50