Finding the Fourth Proportional to 9,109.72, 12,571.29 and 5,130.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.72 : 12,571.29 = 5,130.88 : x
2. Step 2: Convert to fraction form
   9,109.72/12,571.29 = 5,130.88/x
3. Step 3: Cross multiply
   9,109.72x = 12,571.29 × 5,130.88
4. Step 4: Simplify right side
   9,109.72x = 64,501,780.44
5. Step 5: Solve for x
   x = 64,501,780.44/9,109.72
6. Step 6: Final answer
   x = 7,080.54