Finding the Fourth Proportional to 15,355.98, 23,019.57 and 13,986.45

Step by Step Solution

1. Step 1: Write the proportion equation
   15,355.98 : 23,019.57 = 13,986.45 : x
2. Step 2: Convert to fraction form
   15,355.98/23,019.57 = 13,986.45/x
3. Step 3: Cross multiply
   15,355.98x = 23,019.57 × 13,986.45
4. Step 4: Simplify right side
   15,355.98x = 321,962,064.83
5. Step 5: Solve for x
   x = 321,962,064.83/15,355.98
6. Step 6: Final answer
   x = 20,966.56