Finding the Third Proportional to 139,082.50 and 208,530

Step by Step Solution

1. Step 1: Write the proportion equation
   139,082.50 : 208,530 = 208,530 : x
2. Step 2: Convert to fraction form
   139,082.50/208,530 = 208,530/x
3. Step 3: Cross multiply
   139,082.50x = 208,530 × 208,530
4. Step 4: Simplify right side
   139,082.50x = 43,484,760,900
5. Step 5: Solve for x
   x = 43,484,760,900/139,082.50
6. Step 6: Final answer
   x = 312,654.44