Finding the Third Proportional to 399,627 and 603,676.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,627 : 603,676.50 = 603,676.50 : x
2. Step 2: Convert to fraction form
   399,627/603,676.50 = 603,676.50/x
3. Step 3: Cross multiply
   399,627x = 603,676.50 × 603,676.50
4. Step 4: Simplify right side
   399,627x = 364,425,316,652.25
5. Step 5: Solve for x
   x = 364,425,316,652.25/399,627
6. Step 6: Final answer
   x = 911,913.65