Finding the Fourth Proportional to 42,863.50, 64,336.82 and 20,692.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,863.50 : 64,336.82 = 20,692.50 : x
2. Step 2: Convert to fraction form
   42,863.50/64,336.82 = 20,692.50/x
3. Step 3: Cross multiply
   42,863.50x = 64,336.82 × 20,692.50
4. Step 4: Simplify right side
   42,863.50x = 1,331,289,647.85
5. Step 5: Solve for x
   x = 1,331,289,647.85/42,863.50
6. Step 6: Final answer
   x = 31,058.82