Finding the Fourth Proportional to 9,109, 12,570.81 and 5,130.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109 : 12,570.81 = 5,130.34 : x
2. Step 2: Convert to fraction form
   9,109/12,570.81 = 5,130.34/x
3. Step 3: Cross multiply
   9,109x = 12,570.81 × 5,130.34
4. Step 4: Simplify right side
   9,109x = 64,492,529.38
5. Step 5: Solve for x
   x = 64,492,529.38/9,109
6. Step 6: Final answer
   x = 7,080.09