Finding the Fourth Proportional to 21,826.16, 30,123.74 and 12,875.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,826.16 : 30,123.74 = 12,875.88 : x
2. Step 2: Convert to fraction form
   21,826.16/30,123.74 = 12,875.88/x
3. Step 3: Cross multiply
   21,826.16x = 30,123.74 × 12,875.88
4. Step 4: Simplify right side
   21,826.16x = 387,869,661.39
5. Step 5: Solve for x
   x = 387,869,661.39/21,826.16
6. Step 6: Final answer
   x = 17,770.86