Finding the Fourth Proportional to 20,744.60, 31,118.83 and 8,261.61

Step by Step Solution

1. Step 1: Write the proportion equation
   20,744.60 : 31,118.83 = 8,261.61 : x
2. Step 2: Convert to fraction form
   20,744.60/31,118.83 = 8,261.61/x
3. Step 3: Cross multiply
   20,744.60x = 31,118.83 × 8,261.61
4. Step 4: Simplify right side
   20,744.60x = 257,091,499.77
5. Step 5: Solve for x
   x = 257,091,499.77/20,744.60
6. Step 6: Final answer
   x = 12,393.18