Finding the Third Proportional to 65,815 and 142,137.50

Step by Step Solution

1. Step 1: Write the proportion equation
   65,815 : 142,137.50 = 142,137.50 : x
2. Step 2: Convert to fraction form
   65,815/142,137.50 = 142,137.50/x
3. Step 3: Cross multiply
   65,815x = 142,137.50 × 142,137.50
4. Step 4: Simplify right side
   65,815x = 20,203,068,906.25
5. Step 5: Solve for x
   x = 20,203,068,906.25/65,815
6. Step 6: Final answer
   x = 306,967.54