Finding the Third Proportional to 398,338.50 and 860,064

Step by Step Solution

1. Step 1: Write the proportion equation
   398,338.50 : 860,064 = 860,064 : x
2. Step 2: Convert to fraction form
   398,338.50/860,064 = 860,064/x
3. Step 3: Cross multiply
   398,338.50x = 860,064 × 860,064
4. Step 4: Simplify right side
   398,338.50x = 739,710,084,096
5. Step 5: Solve for x
   x = 739,710,084,096/398,338.50
6. Step 6: Final answer
   x = 1,856,988.68