Finding the Third Proportional to 439,155 and 641,992.50

Step by Step Solution

1. Step 1: Write the proportion equation
   439,155 : 641,992.50 = 641,992.50 : x
2. Step 2: Convert to fraction form
   439,155/641,992.50 = 641,992.50/x
3. Step 3: Cross multiply
   439,155x = 641,992.50 × 641,992.50
4. Step 4: Simplify right side
   439,155x = 412,154,370,056.25
5. Step 5: Solve for x
   x = 412,154,370,056.25/439,155
6. Step 6: Final answer
   x = 938,516.86