Finding the Fourth Proportional to 42,877.31, 64,337.90 and 20,413.37

Step by Step Solution

1. Step 1: Write the proportion equation
   42,877.31 : 64,337.90 = 20,413.37 : x
2. Step 2: Convert to fraction form
   42,877.31/64,337.90 = 20,413.37/x
3. Step 3: Cross multiply
   42,877.31x = 64,337.90 × 20,413.37
4. Step 4: Simplify right side
   42,877.31x = 1,313,353,416.50
5. Step 5: Solve for x
   x = 1,313,353,416.50/42,877.31
6. Step 6: Final answer
   x = 30,630.50