Finding the Fourth Proportional to 9,138.81, 12,610.48 and 5,159.69

Step by Step Solution

1. Step 1: Write the proportion equation
   9,138.81 : 12,610.48 = 5,159.69 : x
2. Step 2: Convert to fraction form
   9,138.81/12,610.48 = 5,159.69/x
3. Step 3: Cross multiply
   9,138.81x = 12,610.48 × 5,159.69
4. Step 4: Simplify right side
   9,138.81x = 65,066,167.55
5. Step 5: Solve for x
   x = 65,066,167.55/9,138.81
6. Step 6: Final answer
   x = 7,119.76