Finding the Third Proportional to 21,039.75 and 54,745.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,039.75 : 54,745.88 = 54,745.88 : x
2. Step 2: Convert to fraction form
   21,039.75/54,745.88 = 54,745.88/x
3. Step 3: Cross multiply
   21,039.75x = 54,745.88 × 54,745.88
4. Step 4: Simplify right side
   21,039.75x = 2,997,110,829.52
5. Step 5: Solve for x
   x = 2,997,110,829.52/21,039.75
6. Step 6: Final answer
   x = 142,449.93