Finding the Third Proportional to 978.75 and 2,119.50

Step by Step Solution

1. Step 1: Write the proportion equation
   978.75 : 2,119.50 = 2,119.50 : x
2. Step 2: Convert to fraction form
   978.75/2,119.50 = 2,119.50/x
3. Step 3: Cross multiply
   978.75x = 2,119.50 × 2,119.50
4. Step 4: Simplify right side
   978.75x = 4,492,280.25
5. Step 5: Solve for x
   x = 4,492,280.25/978.75
6. Step 6: Final answer
   x = 4,589.81