Finding the Fourth Proportional to 20,866.50, 28,795.80 and 12,483

Step by Step Solution

1. Step 1: Write the proportion equation
   20,866.50 : 28,795.80 = 12,483 : x
2. Step 2: Convert to fraction form
   20,866.50/28,795.80 = 12,483/x
3. Step 3: Cross multiply
   20,866.50x = 28,795.80 × 12,483
4. Step 4: Simplify right side
   20,866.50x = 359,457,971.40
5. Step 5: Solve for x
   x = 359,457,971.40/20,866.50
6. Step 6: Final answer
   x = 17,226.56