Finding the Third Proportional to 403,061 and 609,128

Step by Step Solution

1. Step 1: Write the proportion equation
   403,061 : 609,128 = 609,128 : x
2. Step 2: Convert to fraction form
   403,061/609,128 = 609,128/x
3. Step 3: Cross multiply
   403,061x = 609,128 × 609,128
4. Step 4: Simplify right side
   403,061x = 371,036,920,384
5. Step 5: Solve for x
   x = 371,036,920,384/403,061
6. Step 6: Final answer
   x = 920,547.81