Finding the Fourth Proportional to 11,191.62, 15,442.23 and 7,212.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,191.62 : 15,442.23 = 7,212.15 : x
2. Step 2: Convert to fraction form
   11,191.62/15,442.23 = 7,212.15/x
3. Step 3: Cross multiply
   11,191.62x = 15,442.23 × 7,212.15
4. Step 4: Simplify right side
   11,191.62x = 111,371,679.09
5. Step 5: Solve for x
   x = 111,371,679.09/11,191.62
6. Step 6: Final answer
   x = 9,951.35