Finding the Fourth Proportional to 21,757.05, 32,616.72 and 12,973.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,757.05 : 32,616.72 = 12,973.50 : x
2. Step 2: Convert to fraction form
   21,757.05/32,616.72 = 12,973.50/x
3. Step 3: Cross multiply
   21,757.05x = 32,616.72 × 12,973.50
4. Step 4: Simplify right side
   21,757.05x = 423,153,016.92
5. Step 5: Solve for x
   x = 423,153,016.92/21,757.05
6. Step 6: Final answer
   x = 19,449.01