Finding the Fourth Proportional to 10,407.06, 15,613.56 and 5,143.68

Step by Step Solution

1. Step 1: Write the proportion equation
   10,407.06 : 15,613.56 = 5,143.68 : x
2. Step 2: Convert to fraction form
   10,407.06/15,613.56 = 5,143.68/x
3. Step 3: Cross multiply
   10,407.06x = 15,613.56 × 5,143.68
4. Step 4: Simplify right side
   10,407.06x = 80,311,156.30
5. Step 5: Solve for x
   x = 80,311,156.30/10,407.06
6. Step 6: Final answer
   x = 7,716.99