Finding the Fourth Proportional to 20,847.42, 31,279.82 and 8,376.31

Step by Step Solution

1. Step 1: Write the proportion equation
   20,847.42 : 31,279.82 = 8,376.31 : x
2. Step 2: Convert to fraction form
   20,847.42/31,279.82 = 8,376.31/x
3. Step 3: Cross multiply
   20,847.42x = 31,279.82 × 8,376.31
4. Step 4: Simplify right side
   20,847.42x = 262,009,348.98
5. Step 5: Solve for x
   x = 262,009,348.98/20,847.42
6. Step 6: Final answer
   x = 12,567.95