Finding the Third Proportional to 151,402 and 318,486.50

Step by Step Solution

1. Step 1: Write the proportion equation
   151,402 : 318,486.50 = 318,486.50 : x
2. Step 2: Convert to fraction form
   151,402/318,486.50 = 318,486.50/x
3. Step 3: Cross multiply
   151,402x = 318,486.50 × 318,486.50
4. Step 4: Simplify right side
   151,402x = 101,433,650,682.25
5. Step 5: Solve for x
   x = 101,433,650,682.25/151,402
6. Step 6: Final answer
   x = 669,962.42