Finding the Third Proportional to 3,685.50 and 5,420.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,685.50 : 5,420.25 = 5,420.25 : x
2. Step 2: Convert to fraction form
   3,685.50/5,420.25 = 5,420.25/x
3. Step 3: Cross multiply
   3,685.50x = 5,420.25 × 5,420.25
4. Step 4: Simplify right side
   3,685.50x = 29,379,110.06
5. Step 5: Solve for x
   x = 29,379,110.06/3,685.50
6. Step 6: Final answer
   x = 7,971.54