Finding the Fourth Proportional to 11,987.40, 17,976.54 and 3,664.84

Step by Step Solution

1. Step 1: Write the proportion equation
   11,987.40 : 17,976.54 = 3,664.84 : x
2. Step 2: Convert to fraction form
   11,987.40/17,976.54 = 3,664.84/x
3. Step 3: Cross multiply
   11,987.40x = 17,976.54 × 3,664.84
4. Step 4: Simplify right side
   11,987.40x = 65,881,142.85
5. Step 5: Solve for x
   x = 65,881,142.85/11,987.40
6. Step 6: Final answer
   x = 5,495.87