Finding the Third Proportional to 57,408.50 and 90,513.75

Step by Step Solution

1. Step 1: Write the proportion equation
   57,408.50 : 90,513.75 = 90,513.75 : x
2. Step 2: Convert to fraction form
   57,408.50/90,513.75 = 90,513.75/x
3. Step 3: Cross multiply
   57,408.50x = 90,513.75 × 90,513.75
4. Step 4: Simplify right side
   57,408.50x = 8,192,738,939.06
5. Step 5: Solve for x
   x = 8,192,738,939.06/57,408.50
6. Step 6: Final answer
   x = 142,709.51