Finding the Fourth Proportional to 9,409.59, 12,973.88 and 8,131.19

Step by Step Solution

1. Step 1: Write the proportion equation
   9,409.59 : 12,973.88 = 8,131.19 : x
2. Step 2: Convert to fraction form
   9,409.59/12,973.88 = 8,131.19/x
3. Step 3: Cross multiply
   9,409.59x = 12,973.88 × 8,131.19
4. Step 4: Simplify right side
   9,409.59x = 105,493,038.78
5. Step 5: Solve for x
   x = 105,493,038.78/9,409.59
6. Step 6: Final answer
   x = 11,211.23