Finding the Third Proportional to 139,448.25 and 287,149.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,448.25 : 287,149.50 = 287,149.50 : x
2. Step 2: Convert to fraction form
   139,448.25/287,149.50 = 287,149.50/x
3. Step 3: Cross multiply
   139,448.25x = 287,149.50 × 287,149.50
4. Step 4: Simplify right side
   139,448.25x = 82,454,835,350.25
5. Step 5: Solve for x
   x = 82,454,835,350.25/139,448.25
6. Step 6: Final answer
   x = 591,293.44