Finding the Third Proportional to 137,390 and 289,540

Step by Step Solution

1. Step 1: Write the proportion equation
   137,390 : 289,540 = 289,540 : x
2. Step 2: Convert to fraction form
   137,390/289,540 = 289,540/x
3. Step 3: Cross multiply
   137,390x = 289,540 × 289,540
4. Step 4: Simplify right side
   137,390x = 83,833,411,600
5. Step 5: Solve for x
   x = 83,833,411,600/137,390
6. Step 6: Final answer
   x = 610,185.69