Finding the Third Proportional to 139,456 and 287,168

Step by Step Solution

1. Step 1: Write the proportion equation
   139,456 : 287,168 = 287,168 : x
2. Step 2: Convert to fraction form
   139,456/287,168 = 287,168/x
3. Step 3: Cross multiply
   139,456x = 287,168 × 287,168
4. Step 4: Simplify right side
   139,456x = 82,465,460,224
5. Step 5: Solve for x
   x = 82,465,460,224/139,456
6. Step 6: Final answer
   x = 591,336.77