Finding the Third Proportional to 243,012 and 327,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   243,012 : 327,139.50 = 327,139.50 : x
2. Step 2: Convert to fraction form
   243,012/327,139.50 = 327,139.50/x
3. Step 3: Cross multiply
   243,012x = 327,139.50 × 327,139.50
4. Step 4: Simplify right side
   243,012x = 107,020,252,460.25
5. Step 5: Solve for x
   x = 107,020,252,460.25/243,012
6. Step 6: Final answer
   x = 440,390.81