Finding the Fourth Proportional to 21,485.92, 32,190.74 and 8,978.37

Step by Step Solution

1. Step 1: Write the proportion equation
   21,485.92 : 32,190.74 = 8,978.37 : x
2. Step 2: Convert to fraction form
   21,485.92/32,190.74 = 8,978.37/x
3. Step 3: Cross multiply
   21,485.92x = 32,190.74 × 8,978.37
4. Step 4: Simplify right side
   21,485.92x = 289,020,363.07
5. Step 5: Solve for x
   x = 289,020,363.07/21,485.92
6. Step 6: Final answer
   x = 13,451.62