Finding the Fourth Proportional to 9,928.71, 13,701.86 and 5,391.58

Step by Step Solution

1. Step 1: Write the proportion equation
   9,928.71 : 13,701.86 = 5,391.58 : x
2. Step 2: Convert to fraction form
   9,928.71/13,701.86 = 5,391.58/x
3. Step 3: Cross multiply
   9,928.71x = 13,701.86 × 5,391.58
4. Step 4: Simplify right side
   9,928.71x = 73,874,647.38
5. Step 5: Solve for x
   x = 73,874,647.38/9,928.71
6. Step 6: Final answer
   x = 7,440.51