Finding the Third Proportional to 387,877.50 and 853,515

Step by Step Solution

1. Step 1: Write the proportion equation
   387,877.50 : 853,515 = 853,515 : x
2. Step 2: Convert to fraction form
   387,877.50/853,515 = 853,515/x
3. Step 3: Cross multiply
   387,877.50x = 853,515 × 853,515
4. Step 4: Simplify right side
   387,877.50x = 728,487,855,225
5. Step 5: Solve for x
   x = 728,487,855,225/387,877.50
6. Step 6: Final answer
   x = 1,878,138.99