Finding the Fourth Proportional to 9,439.12, 12,972.71 and 7,339.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,439.12 : 12,972.71 = 7,339.60 : x
2. Step 2: Convert to fraction form
   9,439.12/12,972.71 = 7,339.60/x
3. Step 3: Cross multiply
   9,439.12x = 12,972.71 × 7,339.60
4. Step 4: Simplify right side
   9,439.12x = 95,214,502.32
5. Step 5: Solve for x
   x = 95,214,502.32/9,439.12
6. Step 6: Final answer
   x = 10,087.22