Finding the Fourth Proportional to 12,719.42, 17,561.51 and 7,946.65

Step by Step Solution

1. Step 1: Write the proportion equation
   12,719.42 : 17,561.51 = 7,946.65 : x
2. Step 2: Convert to fraction form
   12,719.42/17,561.51 = 7,946.65/x
3. Step 3: Cross multiply
   12,719.42x = 17,561.51 × 7,946.65
4. Step 4: Simplify right side
   12,719.42x = 139,555,045.90
5. Step 5: Solve for x
   x = 139,555,045.90/12,719.42
6. Step 6: Final answer
   x = 10,971.81