Finding the Third Proportional to 89,730 and 139,338

Step by Step Solution

1. Step 1: Write the proportion equation
   89,730 : 139,338 = 139,338 : x
2. Step 2: Convert to fraction form
   89,730/139,338 = 139,338/x
3. Step 3: Cross multiply
   89,730x = 139,338 × 139,338
4. Step 4: Simplify right side
   89,730x = 19,415,078,244
5. Step 5: Solve for x
   x = 19,415,078,244/89,730
6. Step 6: Final answer
   x = 216,372.21