Finding the Fourth Proportional to 11,811.30, 17,719.86 and 3,491.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,811.30 : 17,719.86 = 3,491.28 : x
2. Step 2: Convert to fraction form
   11,811.30/17,719.86 = 3,491.28/x
3. Step 3: Cross multiply
   11,811.30x = 17,719.86 × 3,491.28
4. Step 4: Simplify right side
   11,811.30x = 61,864,992.82
5. Step 5: Solve for x
   x = 61,864,992.82/11,811.30
6. Step 6: Final answer
   x = 5,237.78