Finding the Third Proportional to 139,254 and 242,781

Step by Step Solution

1. Step 1: Write the proportion equation
   139,254 : 242,781 = 242,781 : x
2. Step 2: Convert to fraction form
   139,254/242,781 = 242,781/x
3. Step 3: Cross multiply
   139,254x = 242,781 × 242,781
4. Step 4: Simplify right side
   139,254x = 58,942,613,961
5. Step 5: Solve for x
   x = 58,942,613,961/139,254
6. Step 6: Final answer
   x = 423,274.12