Finding the Third Proportional to 90,020 and 196,990

Step by Step Solution

1. Step 1: Write the proportion equation
   90,020 : 196,990 = 196,990 : x
2. Step 2: Convert to fraction form
   90,020/196,990 = 196,990/x
3. Step 3: Cross multiply
   90,020x = 196,990 × 196,990
4. Step 4: Simplify right side
   90,020x = 38,805,060,100
5. Step 5: Solve for x
   x = 38,805,060,100/90,020
6. Step 6: Final answer
   x = 431,071.54