Finding the Third Proportional to 643,172 and 945,488

Step by Step Solution

1. Step 1: Write the proportion equation
   643,172 : 945,488 = 945,488 : x
2. Step 2: Convert to fraction form
   643,172/945,488 = 945,488/x
3. Step 3: Cross multiply
   643,172x = 945,488 × 945,488
4. Step 4: Simplify right side
   643,172x = 893,947,558,144
5. Step 5: Solve for x
   x = 893,947,558,144/643,172
6. Step 6: Final answer
   x = 1,389,904.35