Finding the Fourth Proportional to 21,781.37, 30,054.72 and 12,827.65

Step by Step Solution

1. Step 1: Write the proportion equation
   21,781.37 : 30,054.72 = 12,827.65 : x
2. Step 2: Convert to fraction form
   21,781.37/30,054.72 = 12,827.65/x
3. Step 3: Cross multiply
   21,781.37x = 30,054.72 × 12,827.65
4. Step 4: Simplify right side
   21,781.37x = 385,531,494.93
5. Step 5: Solve for x
   x = 385,531,494.93/21,781.37
6. Step 6: Final answer
   x = 17,700.06