Finding the Third Proportional to 1,642.50 and 3,543

Step by Step Solution

1. Step 1: Write the proportion equation
   1,642.50 : 3,543 = 3,543 : x
2. Step 2: Convert to fraction form
   1,642.50/3,543 = 3,543/x
3. Step 3: Cross multiply
   1,642.50x = 3,543 × 3,543
4. Step 4: Simplify right side
   1,642.50x = 12,552,849
5. Step 5: Solve for x
   x = 12,552,849/1,642.50
6. Step 6: Final answer
   x = 7,642.53