Finding the Fourth Proportional to 20,643.83, 28,483.61 and 12,146.32

Step by Step Solution

1. Step 1: Write the proportion equation
   20,643.83 : 28,483.61 = 12,146.32 : x
2. Step 2: Convert to fraction form
   20,643.83/28,483.61 = 12,146.32/x
3. Step 3: Cross multiply
   20,643.83x = 28,483.61 × 12,146.32
4. Step 4: Simplify right side
   20,643.83x = 345,971,052.29
5. Step 5: Solve for x
   x = 345,971,052.29/20,643.83
6. Step 6: Final answer
   x = 16,759.05