Finding the Fourth Proportional to 9,109.58, 12,571.43 and 5,130.81

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.58 : 12,571.43 = 5,130.81 : x
2. Step 2: Convert to fraction form
   9,109.58/12,571.43 = 5,130.81/x
3. Step 3: Cross multiply
   9,109.58x = 12,571.43 × 5,130.81
4. Step 4: Simplify right side
   9,109.58x = 64,501,593.10
5. Step 5: Solve for x
   x = 64,501,593.10/9,109.58
6. Step 6: Final answer
   x = 7,080.64