Finding the Fourth Proportional to 21,870.14, 30,177.36 and 12,436.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,870.14 : 30,177.36 = 12,436.88 : x
2. Step 2: Convert to fraction form
   21,870.14/30,177.36 = 12,436.88/x
3. Step 3: Cross multiply
   21,870.14x = 30,177.36 × 12,436.88
4. Step 4: Simplify right side
   21,870.14x = 375,312,054.15
5. Step 5: Solve for x
   x = 375,312,054.15/21,870.14
6. Step 6: Final answer
   x = 17,160.94