Finding the Fourth Proportional to 20,885.83, 31,320.99 and 8,401.59

Step by Step Solution

1. Step 1: Write the proportion equation
   20,885.83 : 31,320.99 = 8,401.59 : x
2. Step 2: Convert to fraction form
   20,885.83/31,320.99 = 8,401.59/x
3. Step 3: Cross multiply
   20,885.83x = 31,320.99 × 8,401.59
4. Step 4: Simplify right side
   20,885.83x = 263,146,116.37
5. Step 5: Solve for x
   x = 263,146,116.37/20,885.83
6. Step 6: Final answer
   x = 12,599.27