Finding the Third Proportional to 156,978 and 343,100

Step by Step Solution

1. Step 1: Write the proportion equation
   156,978 : 343,100 = 343,100 : x
2. Step 2: Convert to fraction form
   156,978/343,100 = 343,100/x
3. Step 3: Cross multiply
   156,978x = 343,100 × 343,100
4. Step 4: Simplify right side
   156,978x = 117,717,610,000
5. Step 5: Solve for x
   x = 117,717,610,000/156,978
6. Step 6: Final answer
   x = 749,898.78