Finding the Third Proportional to 149,817 and 320,956.50

Step by Step Solution

1. Step 1: Write the proportion equation
   149,817 : 320,956.50 = 320,956.50 : x
2. Step 2: Convert to fraction form
   149,817/320,956.50 = 320,956.50/x
3. Step 3: Cross multiply
   149,817x = 320,956.50 × 320,956.50
4. Step 4: Simplify right side
   149,817x = 103,013,074,892.25
5. Step 5: Solve for x
   x = 103,013,074,892.25/149,817
6. Step 6: Final answer
   x = 687,592.70