Finding the Third Proportional to 139,409 and 296,800

Step by Step Solution

1. Step 1: Write the proportion equation
   139,409 : 296,800 = 296,800 : x
2. Step 2: Convert to fraction form
   139,409/296,800 = 296,800/x
3. Step 3: Cross multiply
   139,409x = 296,800 × 296,800
4. Step 4: Simplify right side
   139,409x = 88,090,240,000
5. Step 5: Solve for x
   x = 88,090,240,000/139,409
6. Step 6: Final answer
   x = 631,883.45