Finding the Third Proportional to 139,479 and 286,374

Step by Step Solution

1. Step 1: Write the proportion equation
   139,479 : 286,374 = 286,374 : x
2. Step 2: Convert to fraction form
   139,479/286,374 = 286,374/x
3. Step 3: Cross multiply
   139,479x = 286,374 × 286,374
4. Step 4: Simplify right side
   139,479x = 82,010,067,876
5. Step 5: Solve for x
   x = 82,010,067,876/139,479
6. Step 6: Final answer
   x = 587,974.30