Finding the Fourth Proportional to 11,815.72, 17,727.34 and 3,495.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,815.72 : 17,727.34 = 3,495.78 : x
2. Step 2: Convert to fraction form
   11,815.72/17,727.34 = 3,495.78/x
3. Step 3: Cross multiply
   11,815.72x = 17,727.34 × 3,495.78
4. Step 4: Simplify right side
   11,815.72x = 61,970,880.63
5. Step 5: Solve for x
   x = 61,970,880.63/11,815.72
6. Step 6: Final answer
   x = 5,244.78