Finding the Fourth Proportional to 20,783.64, 28,659.60 and 13,701

Step by Step Solution

1. Step 1: Write the proportion equation
   20,783.64 : 28,659.60 = 13,701 : x
2. Step 2: Convert to fraction form
   20,783.64/28,659.60 = 13,701/x
3. Step 3: Cross multiply
   20,783.64x = 28,659.60 × 13,701
4. Step 4: Simplify right side
   20,783.64x = 392,665,179.60
5. Step 5: Solve for x
   x = 392,665,179.60/20,783.64
6. Step 6: Final answer
   x = 18,892.99