Finding the Fourth Proportional to 19,109.80, 28,662.54 and 5,257

Step by Step Solution

1. Step 1: Write the proportion equation
   19,109.80 : 28,662.54 = 5,257 : x
2. Step 2: Convert to fraction form
   19,109.80/28,662.54 = 5,257/x
3. Step 3: Cross multiply
   19,109.80x = 28,662.54 × 5,257
4. Step 4: Simplify right side
   19,109.80x = 150,678,972.78
5. Step 5: Solve for x
   x = 150,678,972.78/19,109.80
6. Step 6: Final answer
   x = 7,884.91