Finding the Third Proportional to 42,628.78 and 66,676.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,628.78 : 66,676.78 = 66,676.78 : x
2. Step 2: Convert to fraction form
   42,628.78/66,676.78 = 66,676.78/x
3. Step 3: Cross multiply
   42,628.78x = 66,676.78 × 66,676.78
4. Step 4: Simplify right side
   42,628.78x = 4,445,793,157.86
5. Step 5: Solve for x
   x = 4,445,793,157.86/42,628.78
6. Step 6: Final answer
   x = 104,290.88