Finding the Fourth Proportional to 9,360.42, 12,918.06 and 5,382.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,360.42 : 12,918.06 = 5,382.78 : x
2. Step 2: Convert to fraction form
   9,360.42/12,918.06 = 5,382.78/x
3. Step 3: Cross multiply
   9,360.42x = 12,918.06 × 5,382.78
4. Step 4: Simplify right side
   9,360.42x = 69,535,075.01
5. Step 5: Solve for x
   x = 69,535,075.01/9,360.42
6. Step 6: Final answer
   x = 7,428.63