Finding the Third Proportional to 138,721.50 and 303,127.50

Step by Step Solution

1. Step 1: Write the proportion equation
   138,721.50 : 303,127.50 = 303,127.50 : x
2. Step 2: Convert to fraction form
   138,721.50/303,127.50 = 303,127.50/x
3. Step 3: Cross multiply
   138,721.50x = 303,127.50 × 303,127.50
4. Step 4: Simplify right side
   138,721.50x = 91,886,281,256.25
5. Step 5: Solve for x
   x = 91,886,281,256.25/138,721.50
6. Step 6: Final answer
   x = 662,379.52