Finding the Third Proportional to 387,252 and 623,870

Step by Step Solution

1. Step 1: Write the proportion equation
   387,252 : 623,870 = 623,870 : x
2. Step 2: Convert to fraction form
   387,252/623,870 = 623,870/x
3. Step 3: Cross multiply
   387,252x = 623,870 × 623,870
4. Step 4: Simplify right side
   387,252x = 389,213,776,900
5. Step 5: Solve for x
   x = 389,213,776,900/387,252
6. Step 6: Final answer
   x = 1,005,065.89