Finding the Third Proportional to 156,870 and 342,900

Step by Step Solution

1. Step 1: Write the proportion equation
   156,870 : 342,900 = 342,900 : x
2. Step 2: Convert to fraction form
   156,870/342,900 = 342,900/x
3. Step 3: Cross multiply
   156,870x = 342,900 × 342,900
4. Step 4: Simplify right side
   156,870x = 117,580,410,000
5. Step 5: Solve for x
   x = 117,580,410,000/156,870
6. Step 6: Final answer
   x = 749,540.45