Finding the Third Proportional to 643,128 and 1,371,672

Step by Step Solution

1. Step 1: Write the proportion equation
   643,128 : 1,371,672 = 1,371,672 : x
2. Step 2: Convert to fraction form
   643,128/1,371,672 = 1,371,672/x
3. Step 3: Cross multiply
   643,128x = 1,371,672 × 1,371,672
4. Step 4: Simplify right side
   643,128x = 1,881,484,075,584
5. Step 5: Solve for x
   x = 1,881,484,075,584/643,128
6. Step 6: Final answer
   x = 2,925,520.39