Finding the Fourth Proportional to 11,591.61, 17,388.78 and 3,691.36

Step by Step Solution

1. Step 1: Write the proportion equation
   11,591.61 : 17,388.78 = 3,691.36 : x
2. Step 2: Convert to fraction form
   11,591.61/17,388.78 = 3,691.36/x
3. Step 3: Cross multiply
   11,591.61x = 17,388.78 × 3,691.36
4. Step 4: Simplify right side
   11,591.61x = 64,188,254.83
5. Step 5: Solve for x
   x = 64,188,254.83/11,591.61
6. Step 6: Final answer
   x = 5,537.48