Finding the Third Proportional to 139,578 and 300,054

Step by Step Solution

1. Step 1: Write the proportion equation
   139,578 : 300,054 = 300,054 : x
2. Step 2: Convert to fraction form
   139,578/300,054 = 300,054/x
3. Step 3: Cross multiply
   139,578x = 300,054 × 300,054
4. Step 4: Simplify right side
   139,578x = 90,032,402,916
5. Step 5: Solve for x
   x = 90,032,402,916/139,578
6. Step 6: Final answer
   x = 645,032.91