Finding the Third Proportional to 89,769 and 139,190

Step by Step Solution

1. Step 1: Write the proportion equation
   89,769 : 139,190 = 139,190 : x
2. Step 2: Convert to fraction form
   89,769/139,190 = 139,190/x
3. Step 3: Cross multiply
   89,769x = 139,190 × 139,190
4. Step 4: Simplify right side
   89,769x = 19,373,856,100
5. Step 5: Solve for x
   x = 19,373,856,100/89,769
6. Step 6: Final answer
   x = 215,819.00