Finding the Fourth Proportional to 42,853.50, 64,321.72 and 20,682.49

Step by Step Solution

1. Step 1: Write the proportion equation
   42,853.50 : 64,321.72 = 20,682.49 : x
2. Step 2: Convert to fraction form
   42,853.50/64,321.72 = 20,682.49/x
3. Step 3: Cross multiply
   42,853.50x = 64,321.72 × 20,682.49
4. Step 4: Simplify right side
   42,853.50x = 1,330,333,118.17
5. Step 5: Solve for x
   x = 1,330,333,118.17/42,853.50
6. Step 6: Final answer
   x = 31,043.74