Finding the Third Proportional to 318,424.50 and 432,678

Step by Step Solution

1. Step 1: Write the proportion equation
   318,424.50 : 432,678 = 432,678 : x
2. Step 2: Convert to fraction form
   318,424.50/432,678 = 432,678/x
3. Step 3: Cross multiply
   318,424.50x = 432,678 × 432,678
4. Step 4: Simplify right side
   318,424.50x = 187,210,251,684
5. Step 5: Solve for x
   x = 187,210,251,684/318,424.50
6. Step 6: Final answer
   x = 587,926.66