Finding the Fourth Proportional to 9,356.69, 12,912.17 and 5,164.94

Step by Step Solution

1. Step 1: Write the proportion equation
   9,356.69 : 12,912.17 = 5,164.94 : x
2. Step 2: Convert to fraction form
   9,356.69/12,912.17 = 5,164.94/x
3. Step 3: Cross multiply
   9,356.69x = 12,912.17 × 5,164.94
4. Step 4: Simplify right side
   9,356.69x = 66,690,583.32
5. Step 5: Solve for x
   x = 66,690,583.32/9,356.69
6. Step 6: Final answer
   x = 7,127.58