Finding the Fourth Proportional to 9,409.94, 12,985.35 and 5,218.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,409.94 : 12,985.35 = 5,218.10 : x
2. Step 2: Convert to fraction form
   9,409.94/12,985.35 = 5,218.10/x
3. Step 3: Cross multiply
   9,409.94x = 12,985.35 × 5,218.10
4. Step 4: Simplify right side
   9,409.94x = 67,758,854.84
5. Step 5: Solve for x
   x = 67,758,854.84/9,409.94
6. Step 6: Final answer
   x = 7,200.77