Finding the Fourth Proportional to 21,196.30, 31,794.72 and 6,405.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,196.30 : 31,794.72 = 6,405.34 : x
2. Step 2: Convert to fraction form
   21,196.30/31,794.72 = 6,405.34/x
3. Step 3: Cross multiply
   21,196.30x = 31,794.72 × 6,405.34
4. Step 4: Simplify right side
   21,196.30x = 203,655,991.80
5. Step 5: Solve for x
   x = 203,655,991.80/21,196.30
6. Step 6: Final answer
   x = 9,608.09