Finding the Fourth Proportional to 9,109.86, 12,571.28 and 5,131.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.86 : 12,571.28 = 5,131.34 : x
2. Step 2: Convert to fraction form
   9,109.86/12,571.28 = 5,131.34/x
3. Step 3: Cross multiply
   9,109.86x = 12,571.28 × 5,131.34
4. Step 4: Simplify right side
   9,109.86x = 64,507,536.93
5. Step 5: Solve for x
   x = 64,507,536.93/9,109.86
6. Step 6: Final answer
   x = 7,081.07