Finding the Fourth Proportional to 9,109.87, 12,571.81 and 5,130.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.87 : 12,571.81 = 5,130.88 : x
2. Step 2: Convert to fraction form
   9,109.87/12,571.81 = 5,130.88/x
3. Step 3: Cross multiply
   9,109.87x = 12,571.81 × 5,130.88
4. Step 4: Simplify right side
   9,109.87x = 64,504,404.24
5. Step 5: Solve for x
   x = 64,504,404.24/9,109.87
6. Step 6: Final answer
   x = 7,080.72