Finding the Third Proportional to 643,588 and 874,066

Step by Step Solution

1. Step 1: Write the proportion equation
   643,588 : 874,066 = 874,066 : x
2. Step 2: Convert to fraction form
   643,588/874,066 = 874,066/x
3. Step 3: Cross multiply
   643,588x = 874,066 × 874,066
4. Step 4: Simplify right side
   643,588x = 763,991,372,356
5. Step 5: Solve for x
   x = 763,991,372,356/643,588
6. Step 6: Final answer
   x = 1,187,081.44