Finding the Fourth Proportional to 11,812.52, 17,719.56 and 3,915

Step by Step Solution

1. Step 1: Write the proportion equation
   11,812.52 : 17,719.56 = 3,915 : x
2. Step 2: Convert to fraction form
   11,812.52/17,719.56 = 3,915/x
3. Step 3: Cross multiply
   11,812.52x = 17,719.56 × 3,915
4. Step 4: Simplify right side
   11,812.52x = 69,372,077.40
5. Step 5: Solve for x
   x = 69,372,077.40/11,812.52
6. Step 6: Final answer
   x = 5,872.76