Finding the Third Proportional to 139,539.50 and 302,711

Step by Step Solution

1. Step 1: Write the proportion equation
   139,539.50 : 302,711 = 302,711 : x
2. Step 2: Convert to fraction form
   139,539.50/302,711 = 302,711/x
3. Step 3: Cross multiply
   139,539.50x = 302,711 × 302,711
4. Step 4: Simplify right side
   139,539.50x = 91,633,949,521
5. Step 5: Solve for x
   x = 91,633,949,521/139,539.50
6. Step 6: Final answer
   x = 656,688.25