Finding the Fourth Proportional to 20,661.94, 31,177.58 and 20,661.94

Step by Step Solution

1. Step 1: Write the proportion equation
   20,661.94 : 31,177.58 = 20,661.94 : x
2. Step 2: Convert to fraction form
   20,661.94/31,177.58 = 20,661.94/x
3. Step 3: Cross multiply
   20,661.94x = 31,177.58 × 20,661.94
4. Step 4: Simplify right side
   20,661.94x = 644,189,287.31
5. Step 5: Solve for x
   x = 644,189,287.31/20,661.94
6. Step 6: Final answer
   x = 31,177.58