Finding the Third Proportional to 30,018 and 64,690.50

Step by Step Solution

1. Step 1: Write the proportion equation
   30,018 : 64,690.50 = 64,690.50 : x
2. Step 2: Convert to fraction form
   30,018/64,690.50 = 64,690.50/x
3. Step 3: Cross multiply
   30,018x = 64,690.50 × 64,690.50
4. Step 4: Simplify right side
   30,018x = 4,184,860,790.25
5. Step 5: Solve for x
   x = 4,184,860,790.25/30,018
6. Step 6: Final answer
   x = 139,411.71