Finding the Third Proportional to 421,818 and 907,648

Step by Step Solution

1. Step 1: Write the proportion equation
   421,818 : 907,648 = 907,648 : x
2. Step 2: Convert to fraction form
   421,818/907,648 = 907,648/x
3. Step 3: Cross multiply
   421,818x = 907,648 × 907,648
4. Step 4: Simplify right side
   421,818x = 823,824,891,904
5. Step 5: Solve for x
   x = 823,824,891,904/421,818
6. Step 6: Final answer
   x = 1,953,033.99