Finding the Fourth Proportional to 19,128.54, 28,690.52 and 5,089.60

Step by Step Solution

1. Step 1: Write the proportion equation
   19,128.54 : 28,690.52 = 5,089.60 : x
2. Step 2: Convert to fraction form
   19,128.54/28,690.52 = 5,089.60/x
3. Step 3: Cross multiply
   19,128.54x = 28,690.52 × 5,089.60
4. Step 4: Simplify right side
   19,128.54x = 146,023,270.59
5. Step 5: Solve for x
   x = 146,023,270.59/19,128.54
6. Step 6: Final answer
   x = 7,633.79