Finding the Third Proportional to 643,144 and 1,379,600

Step by Step Solution

1. Step 1: Write the proportion equation
   643,144 : 1,379,600 = 1,379,600 : x
2. Step 2: Convert to fraction form
   643,144/1,379,600 = 1,379,600/x
3. Step 3: Cross multiply
   643,144x = 1,379,600 × 1,379,600
4. Step 4: Simplify right side
   643,144x = 1,903,296,160,000
5. Step 5: Solve for x
   x = 1,903,296,160,000/643,144
6. Step 6: Final answer
   x = 2,959,362.38