Finding the Third Proportional to 999.94 and 2,155.69

Step by Step Solution

1. Step 1: Write the proportion equation
   999.94 : 2,155.69 = 2,155.69 : x
2. Step 2: Convert to fraction form
   999.94/2,155.69 = 2,155.69/x
3. Step 3: Cross multiply
   999.94x = 2,155.69 × 2,155.69
4. Step 4: Simplify right side
   999.94x = 4,646,988.60
5. Step 5: Solve for x
   x = 4,646,988.60/999.94
6. Step 6: Final answer
   x = 4,647.28