Finding the Fourth Proportional to 11,978.79, 17,967.52 and 3,658.06

Step by Step Solution

1. Step 1: Write the proportion equation
   11,978.79 : 17,967.52 = 3,658.06 : x
2. Step 2: Convert to fraction form
   11,978.79/17,967.52 = 3,658.06/x
3. Step 3: Cross multiply
   11,978.79x = 17,967.52 × 3,658.06
4. Step 4: Simplify right side
   11,978.79x = 65,726,293.24
5. Step 5: Solve for x
   x = 65,726,293.24/11,978.79
6. Step 6: Final answer
   x = 5,486.89