Finding the Fourth Proportional to 21,389.23, 32,066.52 and 8,918.61

Step by Step Solution

1. Step 1: Write the proportion equation
   21,389.23 : 32,066.52 = 8,918.61 : x
2. Step 2: Convert to fraction form
   21,389.23/32,066.52 = 8,918.61/x
3. Step 3: Cross multiply
   21,389.23x = 32,066.52 × 8,918.61
4. Step 4: Simplify right side
   21,389.23x = 285,988,632.24
5. Step 5: Solve for x
   x = 285,988,632.24/21,389.23
6. Step 6: Final answer
   x = 13,370.68