Finding the Third Proportional to 139,451 and 287,155

Step by Step Solution

1. Step 1: Write the proportion equation
   139,451 : 287,155 = 287,155 : x
2. Step 2: Convert to fraction form
   139,451/287,155 = 287,155/x
3. Step 3: Cross multiply
   139,451x = 287,155 × 287,155
4. Step 4: Simplify right side
   139,451x = 82,457,994,025
5. Step 5: Solve for x
   x = 82,457,994,025/139,451
6. Step 6: Final answer
   x = 591,304.43