Finding the Fourth Proportional to 21,662.16, 32,451.78 and 12,870.36

Step by Step Solution

1. Step 1: Write the proportion equation
   21,662.16 : 32,451.78 = 12,870.36 : x
2. Step 2: Convert to fraction form
   21,662.16/32,451.78 = 12,870.36/x
3. Step 3: Cross multiply
   21,662.16x = 32,451.78 × 12,870.36
4. Step 4: Simplify right side
   21,662.16x = 417,666,091.24
5. Step 5: Solve for x
   x = 417,666,091.24/21,662.16
6. Step 6: Final answer
   x = 19,280.91