Finding the Fourth Proportional to 21,131.35, 31,713.01 and 14,451.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,131.35 : 31,713.01 = 14,451.89 : x
2. Step 2: Convert to fraction form
   21,131.35/31,713.01 = 14,451.89/x
3. Step 3: Cross multiply
   21,131.35x = 31,713.01 × 14,451.89
4. Step 4: Simplify right side
   21,131.35x = 458,312,737.39
5. Step 5: Solve for x
   x = 458,312,737.39/21,131.35
6. Step 6: Final answer
   x = 21,688.76