Finding the Fourth Proportional to 9,410.72, 12,986.88 and 5,218.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,410.72 : 12,986.88 = 5,218.88 : x
2. Step 2: Convert to fraction form
   9,410.72/12,986.88 = 5,218.88/x
3. Step 3: Cross multiply
   9,410.72x = 12,986.88 × 5,218.88
4. Step 4: Simplify right side
   9,410.72x = 67,776,968.29
5. Step 5: Solve for x
   x = 67,776,968.29/9,410.72
6. Step 6: Final answer
   x = 7,202.10