Finding the Fourth Proportional to 9,379.98, 12,944.25 and 5,131.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,379.98 : 12,944.25 = 5,131.20 : x
2. Step 2: Convert to fraction form
   9,379.98/12,944.25 = 5,131.20/x
3. Step 3: Cross multiply
   9,379.98x = 12,944.25 × 5,131.20
4. Step 4: Simplify right side
   9,379.98x = 66,419,535.60
5. Step 5: Solve for x
   x = 66,419,535.60/9,379.98
6. Step 6: Final answer
   x = 7,080.99