Finding the Fourth Proportional to 21,100.66, 31,651.29 and 5,518.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,100.66 : 31,651.29 = 5,518.28 : x
2. Step 2: Convert to fraction form
   21,100.66/31,651.29 = 5,518.28/x
3. Step 3: Cross multiply
   21,100.66x = 31,651.29 × 5,518.28
4. Step 4: Simplify right side
   21,100.66x = 174,660,680.58
5. Step 5: Solve for x
   x = 174,660,680.58/21,100.66
6. Step 6: Final answer
   x = 8,277.50