Finding the Third Proportional to 267,780.38 and 391,408.31

Step by Step Solution

1. Step 1: Write the proportion equation
   267,780.38 : 391,408.31 = 391,408.31 : x
2. Step 2: Convert to fraction form
   267,780.38/391,408.31 = 391,408.31/x
3. Step 3: Cross multiply
   267,780.38x = 391,408.31 × 391,408.31
4. Step 4: Simplify right side
   267,780.38x = 153,200,467,094.10
5. Step 5: Solve for x
   x = 153,200,467,094.10/267,780.38
6. Step 6: Final answer
   x = 572,112.38