Finding the Third Proportional to 420,118 and 921,870

Step by Step Solution

1. Step 1: Write the proportion equation
   420,118 : 921,870 = 921,870 : x
2. Step 2: Convert to fraction form
   420,118/921,870 = 921,870/x
3. Step 3: Cross multiply
   420,118x = 921,870 × 921,870
4. Step 4: Simplify right side
   420,118x = 849,844,296,900
5. Step 5: Solve for x
   x = 849,844,296,900/420,118
6. Step 6: Final answer
   x = 2,022,870.47