Finding the Third Proportional to 2,155.69 and 3,079.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.69 : 3,079.88 = 3,079.88 : x
2. Step 2: Convert to fraction form
   2,155.69/3,079.88 = 3,079.88/x
3. Step 3: Cross multiply
   2,155.69x = 3,079.88 × 3,079.88
4. Step 4: Simplify right side
   2,155.69x = 9,485,630.02
5. Step 5: Solve for x
   x = 9,485,630.02/2,155.69
6. Step 6: Final answer
   x = 4,400.28