Finding the Third Proportional to 89,858 and 139,710

Step by Step Solution

1. Step 1: Write the proportion equation
   89,858 : 139,710 = 139,710 : x
2. Step 2: Convert to fraction form
   89,858/139,710 = 139,710/x
3. Step 3: Cross multiply
   89,858x = 139,710 × 139,710
4. Step 4: Simplify right side
   89,858x = 19,518,884,100
5. Step 5: Solve for x
   x = 19,518,884,100/89,858
6. Step 6: Final answer
   x = 217,219.21