Finding the Fourth Proportional to 9,139.50, 12,613.08 and 5,159.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.50 : 12,613.08 = 5,159.16 : x
2. Step 2: Convert to fraction form
   9,139.50/12,613.08 = 5,159.16/x
3. Step 3: Cross multiply
   9,139.50x = 12,613.08 × 5,159.16
4. Step 4: Simplify right side
   9,139.50x = 65,072,897.81
5. Step 5: Solve for x
   x = 65,072,897.81/9,139.50
6. Step 6: Final answer
   x = 7,119.96