Finding the Fourth Proportional to 9,405.38, 12,980.84 and 5,425.65

Step by Step Solution

1. Step 1: Write the proportion equation
   9,405.38 : 12,980.84 = 5,425.65 : x
2. Step 2: Convert to fraction form
   9,405.38/12,980.84 = 5,425.65/x
3. Step 3: Cross multiply
   9,405.38x = 12,980.84 × 5,425.65
4. Step 4: Simplify right side
   9,405.38x = 70,429,494.55
5. Step 5: Solve for x
   x = 70,429,494.55/9,405.38
6. Step 6: Final answer
   x = 7,488.21