Finding the Fourth Proportional to 19,290.34, 28,936.50 and 5,440.42

Step by Step Solution

1. Step 1: Write the proportion equation
   19,290.34 : 28,936.50 = 5,440.42 : x
2. Step 2: Convert to fraction form
   19,290.34/28,936.50 = 5,440.42/x
3. Step 3: Cross multiply
   19,290.34x = 28,936.50 × 5,440.42
4. Step 4: Simplify right side
   19,290.34x = 157,426,713.33
5. Step 5: Solve for x
   x = 157,426,713.33/19,290.34
6. Step 6: Final answer
   x = 8,160.91