Finding the Third Proportional to 156,909 and 342,978

Step by Step Solution

1. Step 1: Write the proportion equation
   156,909 : 342,978 = 342,978 : x
2. Step 2: Convert to fraction form
   156,909/342,978 = 342,978/x
3. Step 3: Cross multiply
   156,909x = 342,978 × 342,978
4. Step 4: Simplify right side
   156,909x = 117,633,908,484
5. Step 5: Solve for x
   x = 117,633,908,484/156,909
6. Step 6: Final answer
   x = 749,695.10