Finding the Fourth Proportional to 11,978.03, 17,967.98 and 3,658.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,978.03 : 17,967.98 = 3,658.12 : x
2. Step 2: Convert to fraction form
   11,978.03/17,967.98 = 3,658.12/x
3. Step 3: Cross multiply
   11,978.03x = 17,967.98 × 3,658.12
4. Step 4: Simplify right side
   11,978.03x = 65,729,027.00
5. Step 5: Solve for x
   x = 65,729,027.00/11,978.03
6. Step 6: Final answer
   x = 5,487.47