Finding the Third Proportional to 5,401.69 and 7,779.80

Step by Step Solution

1. Step 1: Write the proportion equation
   5,401.69 : 7,779.80 = 7,779.80 : x
2. Step 2: Convert to fraction form
   5,401.69/7,779.80 = 7,779.80/x
3. Step 3: Cross multiply
   5,401.69x = 7,779.80 × 7,779.80
4. Step 4: Simplify right side
   5,401.69x = 60,525,239.42
5. Step 5: Solve for x
   x = 60,525,239.42/5,401.69
6. Step 6: Final answer
   x = 11,204.88