Finding the Third Proportional to 243,202 and 388,516.75

Step by Step Solution

1. Step 1: Write the proportion equation
   243,202 : 388,516.75 = 388,516.75 : x
2. Step 2: Convert to fraction form
   243,202/388,516.75 = 388,516.75/x
3. Step 3: Cross multiply
   243,202x = 388,516.75 × 388,516.75
4. Step 4: Simplify right side
   243,202x = 150,945,265,030.56
5. Step 5: Solve for x
   x = 150,945,265,030.56/243,202
6. Step 6: Final answer
   x = 620,657.99