Finding the Fourth Proportional to 7,152.16, 9,870.22 and 3,965.40

Step by Step Solution

1. Step 1: Write the proportion equation
   7,152.16 : 9,870.22 = 3,965.40 : x
2. Step 2: Convert to fraction form
   7,152.16/9,870.22 = 3,965.40/x
3. Step 3: Cross multiply
   7,152.16x = 9,870.22 × 3,965.40
4. Step 4: Simplify right side
   7,152.16x = 39,139,370.39
5. Step 5: Solve for x
   x = 39,139,370.39/7,152.16
6. Step 6: Final answer
   x = 5,472.38