Finding the Fourth Proportional to 9,355.09, 12,912.65 and 5,577.05

Step by Step Solution

1. Step 1: Write the proportion equation
   9,355.09 : 12,912.65 = 5,577.05 : x
2. Step 2: Convert to fraction form
   9,355.09/12,912.65 = 5,577.05/x
3. Step 3: Cross multiply
   9,355.09x = 12,912.65 × 5,577.05
4. Step 4: Simplify right side
   9,355.09x = 72,014,402.23
5. Step 5: Solve for x
   x = 72,014,402.23/9,355.09
6. Step 6: Final answer
   x = 7,697.88