Finding the Third Proportional to 139,558.50 and 302,746.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,558.50 : 302,746.50 = 302,746.50 : x
2. Step 2: Convert to fraction form
   139,558.50/302,746.50 = 302,746.50/x
3. Step 3: Cross multiply
   139,558.50x = 302,746.50 × 302,746.50
4. Step 4: Simplify right side
   139,558.50x = 91,655,443,262.25
5. Step 5: Solve for x
   x = 91,655,443,262.25/139,558.50
6. Step 6: Final answer
   x = 656,752.85