Finding the Fourth Proportional to 21,196.82, 31,801.37 and 6,407.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,196.82 : 31,801.37 = 6,407.91 : x
2. Step 2: Convert to fraction form
   21,196.82/31,801.37 = 6,407.91/x
3. Step 3: Cross multiply
   21,196.82x = 31,801.37 × 6,407.91
4. Step 4: Simplify right side
   21,196.82x = 203,780,284.80
5. Step 5: Solve for x
   x = 203,780,284.80/21,196.82
6. Step 6: Final answer
   x = 9,613.72