Finding the Fourth Proportional to 11,978.67, 17,968.52 and 3,213.56

Step by Step Solution

1. Step 1: Write the proportion equation
   11,978.67 : 17,968.52 = 3,213.56 : x
2. Step 2: Convert to fraction form
   11,978.67/17,968.52 = 3,213.56/x
3. Step 3: Cross multiply
   11,978.67x = 17,968.52 × 3,213.56
4. Step 4: Simplify right side
   11,978.67x = 57,742,917.13
5. Step 5: Solve for x
   x = 57,742,917.13/11,978.67
6. Step 6: Final answer
   x = 4,820.48