Finding the Third Proportional to 1,954.59 and 3,988.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,954.59 : 3,988.78 = 3,988.78 : x
2. Step 2: Convert to fraction form
   1,954.59/3,988.78 = 3,988.78/x
3. Step 3: Cross multiply
   1,954.59x = 3,988.78 × 3,988.78
4. Step 4: Simplify right side
   1,954.59x = 15,910,375.86
5. Step 5: Solve for x
   x = 15,910,375.86/1,954.59
6. Step 6: Final answer
   x = 8,139.99