Finding the Fourth Proportional to 21,106.71, 31,663.71 and 9,419.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,106.71 : 31,663.71 = 9,419.49 : x
2. Step 2: Convert to fraction form
   21,106.71/31,663.71 = 9,419.49/x
3. Step 3: Cross multiply
   21,106.71x = 31,663.71 × 9,419.49
4. Step 4: Simplify right side
   21,106.71x = 298,255,999.71
5. Step 5: Solve for x
   x = 298,255,999.71/21,106.71
6. Step 6: Final answer
   x = 14,130.86