Finding the Fourth Proportional to 21,876.64, 30,186.72 and 12,444.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,876.64 : 30,186.72 = 12,444.16 : x
2. Step 2: Convert to fraction form
   21,876.64/30,186.72 = 12,444.16/x
3. Step 3: Cross multiply
   21,876.64x = 30,186.72 × 12,444.16
4. Step 4: Simplify right side
   21,876.64x = 375,648,373.56
5. Step 5: Solve for x
   x = 375,648,373.56/21,876.64
6. Step 6: Final answer
   x = 17,171.21