Finding the Fourth Proportional to 32,640.78, 48,969.60 and 13,911.42

Step by Step Solution

1. Step 1: Write the proportion equation
   32,640.78 : 48,969.60 = 13,911.42 : x
2. Step 2: Convert to fraction form
   32,640.78/48,969.60 = 13,911.42/x
3. Step 3: Cross multiply
   32,640.78x = 48,969.60 × 13,911.42
4. Step 4: Simplify right side
   32,640.78x = 681,236,672.83
5. Step 5: Solve for x
   x = 681,236,672.83/32,640.78
6. Step 6: Final answer
   x = 20,870.72