Finding the Third Proportional to 139,449.50 and 287,151.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,449.50 : 287,151.50 = 287,151.50 : x
2. Step 2: Convert to fraction form
   139,449.50/287,151.50 = 287,151.50/x
3. Step 3: Cross multiply
   139,449.50x = 287,151.50 × 287,151.50
4. Step 4: Simplify right side
   139,449.50x = 82,455,983,952.25
5. Step 5: Solve for x
   x = 82,455,983,952.25/139,449.50
6. Step 6: Final answer
   x = 591,296.38