Finding the Third Proportional to 41,688 and 90,990

Step by Step Solution

1. Step 1: Write the proportion equation
   41,688 : 90,990 = 90,990 : x
2. Step 2: Convert to fraction form
   41,688/90,990 = 90,990/x
3. Step 3: Cross multiply
   41,688x = 90,990 × 90,990
4. Step 4: Simplify right side
   41,688x = 8,279,180,100
5. Step 5: Solve for x
   x = 8,279,180,100/41,688
6. Step 6: Final answer
   x = 198,598.64