Finding the Fourth Proportional to 9,368.69, 12,928.82 and 5,390.04

Step by Step Solution

1. Step 1: Write the proportion equation
   9,368.69 : 12,928.82 = 5,390.04 : x
2. Step 2: Convert to fraction form
   9,368.69/12,928.82 = 5,390.04/x
3. Step 3: Cross multiply
   9,368.69x = 12,928.82 × 5,390.04
4. Step 4: Simplify right side
   9,368.69x = 69,686,856.95
5. Step 5: Solve for x
   x = 69,686,856.95/9,368.69
6. Step 6: Final answer
   x = 7,438.27