Finding the Fourth Proportional to 11,812.72, 17,715.18 and 3,913.42

Step by Step Solution

1. Step 1: Write the proportion equation
   11,812.72 : 17,715.18 = 3,913.42 : x
2. Step 2: Convert to fraction form
   11,812.72/17,715.18 = 3,913.42/x
3. Step 3: Cross multiply
   11,812.72x = 17,715.18 × 3,913.42
4. Step 4: Simplify right side
   11,812.72x = 69,326,939.72
5. Step 5: Solve for x
   x = 69,326,939.72/11,812.72
6. Step 6: Final answer
   x = 5,868.84