Finding the Fourth Proportional to 8,928.53, 12,319.49 and 5,391.06

Step by Step Solution

1. Step 1: Write the proportion equation
   8,928.53 : 12,319.49 = 5,391.06 : x
2. Step 2: Convert to fraction form
   8,928.53/12,319.49 = 5,391.06/x
3. Step 3: Cross multiply
   8,928.53x = 12,319.49 × 5,391.06
4. Step 4: Simplify right side
   8,928.53x = 66,415,077.04
5. Step 5: Solve for x
   x = 66,415,077.04/8,928.53
6. Step 6: Final answer
   x = 7,438.52