Finding the Fourth Proportional to 21,559.55, 29,751.03 and 12,127.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,559.55 : 29,751.03 = 12,127.50 : x
2. Step 2: Convert to fraction form
   21,559.55/29,751.03 = 12,127.50/x
3. Step 3: Cross multiply
   21,559.55x = 29,751.03 × 12,127.50
4. Step 4: Simplify right side
   21,559.55x = 360,805,616.33
5. Step 5: Solve for x
   x = 360,805,616.33/21,559.55
6. Step 6: Final answer
   x = 16,735.31