Finding the Third Proportional to 139,444.50 and 209,485

Step by Step Solution

1. Step 1: Write the proportion equation
   139,444.50 : 209,485 = 209,485 : x
2. Step 2: Convert to fraction form
   139,444.50/209,485 = 209,485/x
3. Step 3: Cross multiply
   139,444.50x = 209,485 × 209,485
4. Step 4: Simplify right side
   139,444.50x = 43,883,965,225
5. Step 5: Solve for x
   x = 43,883,965,225/139,444.50
6. Step 6: Final answer
   x = 314,705.60