Finding the Third Proportional to 139,453.50 and 287,158.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,453.50 : 287,158.50 = 287,158.50 : x
2. Step 2: Convert to fraction form
   139,453.50/287,158.50 = 287,158.50/x
3. Step 3: Cross multiply
   139,453.50x = 287,158.50 × 287,158.50
4. Step 4: Simplify right side
   139,453.50x = 82,460,004,122.25
5. Step 5: Solve for x
   x = 82,460,004,122.25/139,453.50
6. Step 6: Final answer
   x = 591,308.24