Finding the Fourth Proportional to 12,986.39, 19,481.16 and 5,089.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,986.39 : 19,481.16 = 5,089.02 : x
2. Step 2: Convert to fraction form
   12,986.39/19,481.16 = 5,089.02/x
3. Step 3: Cross multiply
   12,986.39x = 19,481.16 × 5,089.02
4. Step 4: Simplify right side
   12,986.39x = 99,140,012.86
5. Step 5: Solve for x
   x = 99,140,012.86/12,986.39
6. Step 6: Final answer
   x = 7,634.15