Finding the Third Proportional to 149,860.13 and 321,043.50

Step by Step Solution

1. Step 1: Write the proportion equation
   149,860.13 : 321,043.50 = 321,043.50 : x
2. Step 2: Convert to fraction form
   149,860.13/321,043.50 = 321,043.50/x
3. Step 3: Cross multiply
   149,860.13x = 321,043.50 × 321,043.50
4. Step 4: Simplify right side
   149,860.13x = 103,068,928,892.25
5. Step 5: Solve for x
   x = 103,068,928,892.25/149,860.13
6. Step 6: Final answer
   x = 687,767.54