Finding the Fourth Proportional to 9,356.30, 12,911.37 and 5,577.51

Step by Step Solution

1. Step 1: Write the proportion equation
   9,356.30 : 12,911.37 = 5,577.51 : x
2. Step 2: Convert to fraction form
   9,356.30/12,911.37 = 5,577.51/x
3. Step 3: Cross multiply
   9,356.30x = 12,911.37 × 5,577.51
4. Step 4: Simplify right side
   9,356.30x = 72,013,295.29
5. Step 5: Solve for x
   x = 72,013,295.29/9,356.30
6. Step 6: Final answer
   x = 7,696.77