Finding the Fourth Proportional to 11,982.18, 17,978.20 and 4,963.60

Step by Step Solution

1. Step 1: Write the proportion equation
   11,982.18 : 17,978.20 = 4,963.60 : x
2. Step 2: Convert to fraction form
   11,982.18/17,978.20 = 4,963.60/x
3. Step 3: Cross multiply
   11,982.18x = 17,978.20 × 4,963.60
4. Step 4: Simplify right side
   11,982.18x = 89,236,682.07
5. Step 5: Solve for x
   x = 89,236,682.07/11,982.18
6. Step 6: Final answer
   x = 7,447.45