Finding the Fourth Proportional to 11,212.16, 15,462.72 and 7,020.80

Step by Step Solution

1. Step 1: Write the proportion equation
   11,212.16 : 15,462.72 = 7,020.80 : x
2. Step 2: Convert to fraction form
   11,212.16/15,462.72 = 7,020.80/x
3. Step 3: Cross multiply
   11,212.16x = 15,462.72 × 7,020.80
4. Step 4: Simplify right side
   11,212.16x = 108,560,664.58
5. Step 5: Solve for x
   x = 108,560,664.58/11,212.16
6. Step 6: Final answer
   x = 9,682.40