Finding the Third Proportional to 2,779.50 and 4,155

Step by Step Solution

1. Step 1: Write the proportion equation
   2,779.50 : 4,155 = 4,155 : x
2. Step 2: Convert to fraction form
   2,779.50/4,155 = 4,155/x
3. Step 3: Cross multiply
   2,779.50x = 4,155 × 4,155
4. Step 4: Simplify right side
   2,779.50x = 17,264,025
5. Step 5: Solve for x
   x = 17,264,025/2,779.50
6. Step 6: Final answer
   x = 6,211.20