Finding the Third Proportional to 438,615 and 661,162.50

Step by Step Solution

1. Step 1: Write the proportion equation
   438,615 : 661,162.50 = 661,162.50 : x
2. Step 2: Convert to fraction form
   438,615/661,162.50 = 661,162.50/x
3. Step 3: Cross multiply
   438,615x = 661,162.50 × 661,162.50
4. Step 4: Simplify right side
   438,615x = 437,135,851,406.25
5. Step 5: Solve for x
   x = 437,135,851,406.25/438,615
6. Step 6: Final answer
   x = 996,627.68