Finding the Third Proportional to 345,978 and 748,818

Step by Step Solution

1. Step 1: Write the proportion equation
   345,978 : 748,818 = 748,818 : x
2. Step 2: Convert to fraction form
   345,978/748,818 = 748,818/x
3. Step 3: Cross multiply
   345,978x = 748,818 × 748,818
4. Step 4: Simplify right side
   345,978x = 560,728,397,124
5. Step 5: Solve for x
   x = 560,728,397,124/345,978
6. Step 6: Final answer
   x = 1,620,705.35