Finding the Third Proportional to 139,450.50 and 287,152.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,450.50 : 287,152.50 = 287,152.50 : x
2. Step 2: Convert to fraction form
   139,450.50/287,152.50 = 287,152.50/x
3. Step 3: Cross multiply
   139,450.50x = 287,152.50 × 287,152.50
4. Step 4: Simplify right side
   139,450.50x = 82,456,558,256.25
5. Step 5: Solve for x
   x = 82,456,558,256.25/139,450.50
6. Step 6: Final answer
   x = 591,296.25