Finding the Fourth Proportional to 9,109.77, 12,571.02 and 5,131.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.77 : 12,571.02 = 5,131.12 : x
2. Step 2: Convert to fraction form
   9,109.77/12,571.02 = 5,131.12/x
3. Step 3: Cross multiply
   9,109.77x = 12,571.02 × 5,131.12
4. Step 4: Simplify right side
   9,109.77x = 64,503,412.14
5. Step 5: Solve for x
   x = 64,503,412.14/9,109.77
6. Step 6: Final answer
   x = 7,080.69