Finding the Third Proportional to 1,918.69 and 3,915.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,918.69 : 3,915.84 = 3,915.84 : x
2. Step 2: Convert to fraction form
   1,918.69/3,915.84 = 3,915.84/x
3. Step 3: Cross multiply
   1,918.69x = 3,915.84 × 3,915.84
4. Step 4: Simplify right side
   1,918.69x = 15,333,832.27
5. Step 5: Solve for x
   x = 15,333,832.27/1,918.69
6. Step 6: Final answer
   x = 7,991.83