Finding the Fourth Proportional to 20,762, 31,152.72 and 9,078.56

Step by Step Solution

1. Step 1: Write the proportion equation
   20,762 : 31,152.72 = 9,078.56 : x
2. Step 2: Convert to fraction form
   20,762/31,152.72 = 9,078.56/x
3. Step 3: Cross multiply
   20,762x = 31,152.72 × 9,078.56
4. Step 4: Simplify right side
   20,762x = 282,821,837.68
5. Step 5: Solve for x
   x = 282,821,837.68/20,762
6. Step 6: Final answer
   x = 13,622.09