Finding the Fourth Proportional to 11,815.81, 17,719.56 and 3,493.60

Step by Step Solution

1. Step 1: Write the proportion equation
   11,815.81 : 17,719.56 = 3,493.60 : x
2. Step 2: Convert to fraction form
   11,815.81/17,719.56 = 3,493.60/x
3. Step 3: Cross multiply
   11,815.81x = 17,719.56 × 3,493.60
4. Step 4: Simplify right side
   11,815.81x = 61,905,010.52
5. Step 5: Solve for x
   x = 61,905,010.52/11,815.81
6. Step 6: Final answer
   x = 5,239.17