Finding the Fourth Proportional to 9,361.31, 12,918.89 and 5,382.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,361.31 : 12,918.89 = 5,382.79 : x
2. Step 2: Convert to fraction form
   9,361.31/12,918.89 = 5,382.79/x
3. Step 3: Cross multiply
   9,361.31x = 12,918.89 × 5,382.79
4. Step 4: Simplify right side
   9,361.31x = 69,539,653.06
5. Step 5: Solve for x
   x = 69,539,653.06/9,361.31
6. Step 6: Final answer
   x = 7,428.41