Finding the Third Proportional to 644,013 and 847,111.50

Step by Step Solution

1. Step 1: Write the proportion equation
   644,013 : 847,111.50 = 847,111.50 : x
2. Step 2: Convert to fraction form
   644,013/847,111.50 = 847,111.50/x
3. Step 3: Cross multiply
   644,013x = 847,111.50 × 847,111.50
4. Step 4: Simplify right side
   644,013x = 717,597,893,432.25
5. Step 5: Solve for x
   x = 717,597,893,432.25/644,013
6. Step 6: Final answer
   x = 1,114,259.95