Finding the Third Proportional to 139,088 and 300,346

Step by Step Solution

1. Step 1: Write the proportion equation
   139,088 : 300,346 = 300,346 : x
2. Step 2: Convert to fraction form
   139,088/300,346 = 300,346/x
3. Step 3: Cross multiply
   139,088x = 300,346 × 300,346
4. Step 4: Simplify right side
   139,088x = 90,207,719,716
5. Step 5: Solve for x
   x = 90,207,719,716/139,088
6. Step 6: Final answer
   x = 648,565.80