Finding the Third Proportional to 999.50 and 2,156

Step by Step Solution

1. Step 1: Write the proportion equation
   999.50 : 2,156 = 2,156 : x
2. Step 2: Convert to fraction form
   999.50/2,156 = 2,156/x
3. Step 3: Cross multiply
   999.50x = 2,156 × 2,156
4. Step 4: Simplify right side
   999.50x = 4,648,336
5. Step 5: Solve for x
   x = 4,648,336/999.50
6. Step 6: Final answer
   x = 4,650.66