Finding the Third Proportional to 258,119 and 391,064

Step by Step Solution

1. Step 1: Write the proportion equation
   258,119 : 391,064 = 391,064 : x
2. Step 2: Convert to fraction form
   258,119/391,064 = 391,064/x
3. Step 3: Cross multiply
   258,119x = 391,064 × 391,064
4. Step 4: Simplify right side
   258,119x = 152,931,052,096
5. Step 5: Solve for x
   x = 152,931,052,096/258,119
6. Step 6: Final answer
   x = 592,482.74