Finding the Fourth Proportional to 20,985.98, 31,467.46 and 8,322.91

Step by Step Solution

1. Step 1: Write the proportion equation
   20,985.98 : 31,467.46 = 8,322.91 : x
2. Step 2: Convert to fraction form
   20,985.98/31,467.46 = 8,322.91/x
3. Step 3: Cross multiply
   20,985.98x = 31,467.46 × 8,322.91
4. Step 4: Simplify right side
   20,985.98x = 261,900,837.51
5. Step 5: Solve for x
   x = 261,900,837.51/20,985.98
6. Step 6: Final answer
   x = 12,479.80