Finding the Third Proportional to 89,716 and 139,312

Step by Step Solution

1. Step 1: Write the proportion equation
   89,716 : 139,312 = 139,312 : x
2. Step 2: Convert to fraction form
   89,716/139,312 = 139,312/x
3. Step 3: Cross multiply
   89,716x = 139,312 × 139,312
4. Step 4: Simplify right side
   89,716x = 19,407,833,344
5. Step 5: Solve for x
   x = 19,407,833,344/89,716
6. Step 6: Final answer
   x = 216,325.22