Finding the Third Proportional to 638,628 and 1,064,340

Step by Step Solution

1. Step 1: Write the proportion equation
   638,628 : 1,064,340 = 1,064,340 : x
2. Step 2: Convert to fraction form
   638,628/1,064,340 = 1,064,340/x
3. Step 3: Cross multiply
   638,628x = 1,064,340 × 1,064,340
4. Step 4: Simplify right side
   638,628x = 1,132,819,635,600
5. Step 5: Solve for x
   x = 1,132,819,635,600/638,628
6. Step 6: Final answer
   x = 1,773,833.34