Finding the Fourth Proportional to 9,399.12, 12,970.64 and 5,150.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,399.12 : 12,970.64 = 5,150.15 : x
2. Step 2: Convert to fraction form
   9,399.12/12,970.64 = 5,150.15/x
3. Step 3: Cross multiply
   9,399.12x = 12,970.64 × 5,150.15
4. Step 4: Simplify right side
   9,399.12x = 66,800,741.60
5. Step 5: Solve for x
   x = 66,800,741.60/9,399.12
6. Step 6: Final answer
   x = 7,107.13