Finding the Fourth Proportional to 21,131.48, 31,673.28 and 16,416.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,131.48 : 31,673.28 = 16,416.47 : x
2. Step 2: Convert to fraction form
   21,131.48/31,673.28 = 16,416.47/x
3. Step 3: Cross multiply
   21,131.48x = 31,673.28 × 16,416.47
4. Step 4: Simplify right side
   21,131.48x = 519,963,499.32
5. Step 5: Solve for x
   x = 519,963,499.32/21,131.48
6. Step 6: Final answer
   x = 24,606.11