Finding the Third Proportional to 321,615 and 485,698.50

Step by Step Solution

1. Step 1: Write the proportion equation
   321,615 : 485,698.50 = 485,698.50 : x
2. Step 2: Convert to fraction form
   321,615/485,698.50 = 485,698.50/x
3. Step 3: Cross multiply
   321,615x = 485,698.50 × 485,698.50
4. Step 4: Simplify right side
   321,615x = 235,903,032,902.25
5. Step 5: Solve for x
   x = 235,903,032,902.25/321,615
6. Step 6: Final answer
   x = 733,495.12