Finding the Fourth Proportional to 19,181.37, 28,769.76 and 5,142.45

Step by Step Solution

1. Step 1: Write the proportion equation
   19,181.37 : 28,769.76 = 5,142.45 : x
2. Step 2: Convert to fraction form
   19,181.37/28,769.76 = 5,142.45/x
3. Step 3: Cross multiply
   19,181.37x = 28,769.76 × 5,142.45
4. Step 4: Simplify right side
   19,181.37x = 147,947,052.31
5. Step 5: Solve for x
   x = 147,947,052.31/19,181.37
6. Step 6: Final answer
   x = 7,713.06