Finding the Fourth Proportional to 9,205.40, 12,704.70 and 5,479

Step by Step Solution

1. Step 1: Write the proportion equation
   9,205.40 : 12,704.70 = 5,479 : x
2. Step 2: Convert to fraction form
   9,205.40/12,704.70 = 5,479/x
3. Step 3: Cross multiply
   9,205.40x = 12,704.70 × 5,479
4. Step 4: Simplify right side
   9,205.40x = 69,609,051.30
5. Step 5: Solve for x
   x = 69,609,051.30/9,205.40
6. Step 6: Final answer
   x = 7,561.76