Finding the Fourth Proportional to 9,339.72, 12,888.90 and 5,148.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,339.72 : 12,888.90 = 5,148.12 : x
2. Step 2: Convert to fraction form
   9,339.72/12,888.90 = 5,148.12/x
3. Step 3: Cross multiply
   9,339.72x = 12,888.90 × 5,148.12
4. Step 4: Simplify right side
   9,339.72x = 66,353,603.87
5. Step 5: Solve for x
   x = 66,353,603.87/9,339.72
6. Step 6: Final answer
   x = 7,104.45