Finding the Third Proportional to 139,446.75 and 287,146.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,446.75 : 287,146.50 = 287,146.50 : x
2. Step 2: Convert to fraction form
   139,446.75/287,146.50 = 287,146.50/x
3. Step 3: Cross multiply
   139,446.75x = 287,146.50 × 287,146.50
4. Step 4: Simplify right side
   139,446.75x = 82,453,112,462.25
5. Step 5: Solve for x
   x = 82,453,112,462.25/139,446.75
6. Step 6: Final answer
   x = 591,287.44