Finding the Fourth Proportional to 9,109.56, 12,571.23 and 5,130.73

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.56 : 12,571.23 = 5,130.73 : x
2. Step 2: Convert to fraction form
   9,109.56/12,571.23 = 5,130.73/x
3. Step 3: Cross multiply
   9,109.56x = 12,571.23 × 5,130.73
4. Step 4: Simplify right side
   9,109.56x = 64,499,586.90
5. Step 5: Solve for x
   x = 64,499,586.90/9,109.56
6. Step 6: Final answer
   x = 7,080.43