Finding the Fourth Proportional to 11,985.22, 17,978.91 and 3,219.94

Step by Step Solution

1. Step 1: Write the proportion equation
   11,985.22 : 17,978.91 = 3,219.94 : x
2. Step 2: Convert to fraction form
   11,985.22/17,978.91 = 3,219.94/x
3. Step 3: Cross multiply
   11,985.22x = 17,978.91 × 3,219.94
4. Step 4: Simplify right side
   11,985.22x = 57,891,011.47
5. Step 5: Solve for x
   x = 57,891,011.47/11,985.22
6. Step 6: Final answer
   x = 4,830.20