Finding the Fourth Proportional to 9,404.90, 12,980.67 and 5,425.47

Step by Step Solution

1. Step 1: Write the proportion equation
   9,404.90 : 12,980.67 = 5,425.47 : x
2. Step 2: Convert to fraction form
   9,404.90/12,980.67 = 5,425.47/x
3. Step 3: Cross multiply
   9,404.90x = 12,980.67 × 5,425.47
4. Step 4: Simplify right side
   9,404.90x = 70,426,235.66
5. Step 5: Solve for x
   x = 70,426,235.66/9,404.90
6. Step 6: Final answer
   x = 7,488.25