Finding the Fourth Proportional to 9,409.82, 12,985.61 and 5,218.07

Step by Step Solution

1. Step 1: Write the proportion equation
   9,409.82 : 12,985.61 = 5,218.07 : x
2. Step 2: Convert to fraction form
   9,409.82/12,985.61 = 5,218.07/x
3. Step 3: Cross multiply
   9,409.82x = 12,985.61 × 5,218.07
4. Step 4: Simplify right side
   9,409.82x = 67,759,730.95
5. Step 5: Solve for x
   x = 67,759,730.95/9,409.82
6. Step 6: Final answer
   x = 7,200.96