Finding the Fourth Proportional to 11,985.42, 17,977.19 and 3,665.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,985.42 : 17,977.19 = 3,665.50 : x
2. Step 2: Convert to fraction form
   11,985.42/17,977.19 = 3,665.50/x
3. Step 3: Cross multiply
   11,985.42x = 17,977.19 × 3,665.50
4. Step 4: Simplify right side
   11,985.42x = 65,895,448.41
5. Step 5: Solve for x
   x = 65,895,448.41/11,985.42
6. Step 6: Final answer
   x = 5,497.97