Finding the Third Proportional to 1,678.78 and 3,602.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,678.78 : 3,602.53 = 3,602.53 : x
2. Step 2: Convert to fraction form
   1,678.78/3,602.53 = 3,602.53/x
3. Step 3: Cross multiply
   1,678.78x = 3,602.53 × 3,602.53
4. Step 4: Simplify right side
   1,678.78x = 12,978,231.41
5. Step 5: Solve for x
   x = 12,978,231.41/1,678.78
6. Step 6: Final answer
   x = 7,730.75