Finding the Fourth Proportional to 21,669.76, 32,498.20 and 9,189.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,669.76 : 32,498.20 = 9,189.60 : x
2. Step 2: Convert to fraction form
   21,669.76/32,498.20 = 9,189.60/x
3. Step 3: Cross multiply
   21,669.76x = 32,498.20 × 9,189.60
4. Step 4: Simplify right side
   21,669.76x = 298,645,458.72
5. Step 5: Solve for x
   x = 298,645,458.72/21,669.76
6. Step 6: Final answer
   x = 13,781.67