Finding the Third Proportional to 57,436 and 85,809

Step by Step Solution

1. Step 1: Write the proportion equation
   57,436 : 85,809 = 85,809 : x
2. Step 2: Convert to fraction form
   57,436/85,809 = 85,809/x
3. Step 3: Cross multiply
   57,436x = 85,809 × 85,809
4. Step 4: Simplify right side
   57,436x = 7,363,184,481
5. Step 5: Solve for x
   x = 7,363,184,481/57,436
6. Step 6: Final answer
   x = 128,198.07