Finding the Third Proportional to 139,538.50 and 302,709

Step by Step Solution

1. Step 1: Write the proportion equation
   139,538.50 : 302,709 = 302,709 : x
2. Step 2: Convert to fraction form
   139,538.50/302,709 = 302,709/x
3. Step 3: Cross multiply
   139,538.50x = 302,709 × 302,709
4. Step 4: Simplify right side
   139,538.50x = 91,632,738,681
5. Step 5: Solve for x
   x = 91,632,738,681/139,538.50
6. Step 6: Final answer
   x = 656,684.27