Finding the Third Proportional to 149,100.75 and 320,449.50

Step by Step Solution

1. Step 1: Write the proportion equation
   149,100.75 : 320,449.50 = 320,449.50 : x
2. Step 2: Convert to fraction form
   149,100.75/320,449.50 = 320,449.50/x
3. Step 3: Cross multiply
   149,100.75x = 320,449.50 × 320,449.50
4. Step 4: Simplify right side
   149,100.75x = 102,687,882,050.25
5. Step 5: Solve for x
   x = 102,687,882,050.25/149,100.75
6. Step 6: Final answer
   x = 688,714.73