Finding the Fourth Proportional to 21,654.50, 32,481.78 and 5,238.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,654.50 : 32,481.78 = 5,238.50 : x
2. Step 2: Convert to fraction form
   21,654.50/32,481.78 = 5,238.50/x
3. Step 3: Cross multiply
   21,654.50x = 32,481.78 × 5,238.50
4. Step 4: Simplify right side
   21,654.50x = 170,155,804.53
5. Step 5: Solve for x
   x = 170,155,804.53/21,654.50
6. Step 6: Final answer
   x = 7,857.76