Finding the Third Proportional to 123,390 and 267,919.50

Step by Step Solution

1. Step 1: Write the proportion equation
   123,390 : 267,919.50 = 267,919.50 : x
2. Step 2: Convert to fraction form
   123,390/267,919.50 = 267,919.50/x
3. Step 3: Cross multiply
   123,390x = 267,919.50 × 267,919.50
4. Step 4: Simplify right side
   123,390x = 71,780,858,480.25
5. Step 5: Solve for x
   x = 71,780,858,480.25/123,390
6. Step 6: Final answer
   x = 581,739.67