Finding the Fourth Proportional to 8,889.76, 12,291.20 and 7,397.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,889.76 : 12,291.20 = 7,397.12 : x
2. Step 2: Convert to fraction form
   8,889.76/12,291.20 = 7,397.12/x
3. Step 3: Cross multiply
   8,889.76x = 12,291.20 × 7,397.12
4. Step 4: Simplify right side
   8,889.76x = 90,919,481.34
5. Step 5: Solve for x
   x = 90,919,481.34/8,889.76
6. Step 6: Final answer
   x = 10,227.44