Finding the Third Proportional to 670.78 and 1,445.34

Step by Step Solution

1. Step 1: Write the proportion equation
   670.78 : 1,445.34 = 1,445.34 : x
2. Step 2: Convert to fraction form
   670.78/1,445.34 = 1,445.34/x
3. Step 3: Cross multiply
   670.78x = 1,445.34 × 1,445.34
4. Step 4: Simplify right side
   670.78x = 2,089,018.56
5. Step 5: Solve for x
   x = 2,089,018.56/670.78
6. Step 6: Final answer
   x = 3,114.31