Finding the Fourth Proportional to 9,355.56, 12,910.35 and 5,576.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,355.56 : 12,910.35 = 5,576.78 : x
2. Step 2: Convert to fraction form
   9,355.56/12,910.35 = 5,576.78/x
3. Step 3: Cross multiply
   9,355.56x = 12,910.35 × 5,576.78
4. Step 4: Simplify right side
   9,355.56x = 71,998,089.24
5. Step 5: Solve for x
   x = 71,998,089.24/9,355.56
6. Step 6: Final answer
   x = 7,695.76