Finding the Third Proportional to 139,090 and 300,350

Step by Step Solution

1. Step 1: Write the proportion equation
   139,090 : 300,350 = 300,350 : x
2. Step 2: Convert to fraction form
   139,090/300,350 = 300,350/x
3. Step 3: Cross multiply
   139,090x = 300,350 × 300,350
4. Step 4: Simplify right side
   139,090x = 90,210,122,500
5. Step 5: Solve for x
   x = 90,210,122,500/139,090
6. Step 6: Final answer
   x = 648,573.75