Finding the Third Proportional to 192,870 and 420,012

Step by Step Solution

1. Step 1: Write the proportion equation
   192,870 : 420,012 = 420,012 : x
2. Step 2: Convert to fraction form
   192,870/420,012 = 420,012/x
3. Step 3: Cross multiply
   192,870x = 420,012 × 420,012
4. Step 4: Simplify right side
   192,870x = 176,410,080,144
5. Step 5: Solve for x
   x = 176,410,080,144/192,870
6. Step 6: Final answer
   x = 914,657.96