Finding the Third Proportional to 139,308 and 210,258

Step by Step Solution

1. Step 1: Write the proportion equation
   139,308 : 210,258 = 210,258 : x
2. Step 2: Convert to fraction form
   139,308/210,258 = 210,258/x
3. Step 3: Cross multiply
   139,308x = 210,258 × 210,258
4. Step 4: Simplify right side
   139,308x = 44,208,426,564
5. Step 5: Solve for x
   x = 44,208,426,564/139,308
6. Step 6: Final answer
   x = 317,343.06