Finding the Third Proportional to 123,390 and 265,806

Step by Step Solution

1. Step 1: Write the proportion equation
   123,390 : 265,806 = 265,806 : x
2. Step 2: Convert to fraction form
   123,390/265,806 = 265,806/x
3. Step 3: Cross multiply
   123,390x = 265,806 × 265,806
4. Step 4: Simplify right side
   123,390x = 70,652,829,636
5. Step 5: Solve for x
   x = 70,652,829,636/123,390
6. Step 6: Final answer
   x = 572,597.70