Finding the Fourth Proportional to 21,968.50, 32,938.89 and 18,637.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,968.50 : 32,938.89 = 18,637.91 : x
2. Step 2: Convert to fraction form
   21,968.50/32,938.89 = 18,637.91/x
3. Step 3: Cross multiply
   21,968.50x = 32,938.89 × 18,637.91
4. Step 4: Simplify right side
   21,968.50x = 613,912,067.32
5. Step 5: Solve for x
   x = 613,912,067.32/21,968.50
6. Step 6: Final answer
   x = 27,945.11