Finding the Fourth Proportional to 11,196.28, 15,448.20 and 7,212.70

Step by Step Solution

1. Step 1: Write the proportion equation
   11,196.28 : 15,448.20 = 7,212.70 : x
2. Step 2: Convert to fraction form
   11,196.28/15,448.20 = 7,212.70/x
3. Step 3: Cross multiply
   11,196.28x = 15,448.20 × 7,212.70
4. Step 4: Simplify right side
   11,196.28x = 111,423,154.90
5. Step 5: Solve for x
   x = 111,423,154.90/11,196.28
6. Step 6: Final answer
   x = 9,951.81