Finding the Third Proportional to 267,642 and 391,412.25

Step by Step Solution

1. Step 1: Write the proportion equation
   267,642 : 391,412.25 = 391,412.25 : x
2. Step 2: Convert to fraction form
   267,642/391,412.25 = 391,412.25/x
3. Step 3: Cross multiply
   267,642x = 391,412.25 × 391,412.25
4. Step 4: Simplify right side
   267,642x = 153,203,549,450.06
5. Step 5: Solve for x
   x = 153,203,549,450.06/267,642
6. Step 6: Final answer
   x = 572,419.69