Finding the Fourth Proportional to 9,109.48, 12,571.78 and 5,131.08

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.48 : 12,571.78 = 5,131.08 : x
2. Step 2: Convert to fraction form
   9,109.48/12,571.78 = 5,131.08/x
3. Step 3: Cross multiply
   9,109.48x = 12,571.78 × 5,131.08
4. Step 4: Simplify right side
   9,109.48x = 64,506,808.92
5. Step 5: Solve for x
   x = 64,506,808.92/9,109.48
6. Step 6: Final answer
   x = 7,081.28