Finding the Fourth Proportional to 9,409.59, 12,984.71 and 5,218.11

Step by Step Solution

1. Step 1: Write the proportion equation
   9,409.59 : 12,984.71 = 5,218.11 : x
2. Step 2: Convert to fraction form
   9,409.59/12,984.71 = 5,218.11/x
3. Step 3: Cross multiply
   9,409.59x = 12,984.71 × 5,218.11
4. Step 4: Simplify right side
   9,409.59x = 67,755,619.01
5. Step 5: Solve for x
   x = 67,755,619.01/9,409.59
6. Step 6: Final answer
   x = 7,200.70