Finding the Third Proportional to 438,615 and 571,657.50

Step by Step Solution

1. Step 1: Write the proportion equation
   438,615 : 571,657.50 = 571,657.50 : x
2. Step 2: Convert to fraction form
   438,615/571,657.50 = 571,657.50/x
3. Step 3: Cross multiply
   438,615x = 571,657.50 × 571,657.50
4. Step 4: Simplify right side
   438,615x = 326,792,297,306.25
5. Step 5: Solve for x
   x = 326,792,297,306.25/438,615
6. Step 6: Final answer
   x = 745,055.00