Finding the Fourth Proportional to 11,980.17, 17,967.78 and 3,213

Step by Step Solution

1. Step 1: Write the proportion equation
   11,980.17 : 17,967.78 = 3,213 : x
2. Step 2: Convert to fraction form
   11,980.17/17,967.78 = 3,213/x
3. Step 3: Cross multiply
   11,980.17x = 17,967.78 × 3,213
4. Step 4: Simplify right side
   11,980.17x = 57,730,477.14
5. Step 5: Solve for x
   x = 57,730,477.14/11,980.17
6. Step 6: Final answer
   x = 4,818.84