Finding the Fourth Proportional to 20,618.75, 30,932.69 and 8,771.90

Step by Step Solution

1. Step 1: Write the proportion equation
   20,618.75 : 30,932.69 = 8,771.90 : x
2. Step 2: Convert to fraction form
   20,618.75/30,932.69 = 8,771.90/x
3. Step 3: Cross multiply
   20,618.75x = 30,932.69 × 8,771.90
4. Step 4: Simplify right side
   20,618.75x = 271,338,264.89
5. Step 5: Solve for x
   x = 271,338,264.89/20,618.75
6. Step 6: Final answer
   x = 13,159.78