Finding the Fourth Proportional to 20,405.37, 30,604.47 and 5,610.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,405.37 : 30,604.47 = 5,610.72 : x
2. Step 2: Convert to fraction form
   20,405.37/30,604.47 = 5,610.72/x
3. Step 3: Cross multiply
   20,405.37x = 30,604.47 × 5,610.72
4. Step 4: Simplify right side
   20,405.37x = 171,713,111.92
5. Step 5: Solve for x
   x = 171,713,111.92/20,405.37
6. Step 6: Final answer
   x = 8,415.09