Finding the Third Proportional to 476,110 and 645,890

Step by Step Solution

1. Step 1: Write the proportion equation
   476,110 : 645,890 = 645,890 : x
2. Step 2: Convert to fraction form
   476,110/645,890 = 645,890/x
3. Step 3: Cross multiply
   476,110x = 645,890 × 645,890
4. Step 4: Simplify right side
   476,110x = 417,173,892,100
5. Step 5: Solve for x
   x = 417,173,892,100/476,110
6. Step 6: Final answer
   x = 876,213.25