Finding the Fourth Proportional to 42,783.28, 64,185.84 and 17,815

Step by Step Solution

1. Step 1: Write the proportion equation
   42,783.28 : 64,185.84 = 17,815 : x
2. Step 2: Convert to fraction form
   42,783.28/64,185.84 = 17,815/x
3. Step 3: Cross multiply
   42,783.28x = 64,185.84 × 17,815
4. Step 4: Simplify right side
   42,783.28x = 1,143,470,739.60
5. Step 5: Solve for x
   x = 1,143,470,739.60/42,783.28
6. Step 6: Final answer
   x = 26,727.05