Finding the Fourth Proportional to 19,128.29, 28,690.15 and 5,089.35

Step by Step Solution

1. Step 1: Write the proportion equation
   19,128.29 : 28,690.15 = 5,089.35 : x
2. Step 2: Convert to fraction form
   19,128.29/28,690.15 = 5,089.35/x
3. Step 3: Cross multiply
   19,128.29x = 28,690.15 × 5,089.35
4. Step 4: Simplify right side
   19,128.29x = 146,014,214.90
5. Step 5: Solve for x
   x = 146,014,214.90/19,128.29
6. Step 6: Final answer
   x = 7,633.42