Finding the Fourth Proportional to 20,986.55, 28,902.72 and 17,416.88

Step by Step Solution

1. Step 1: Write the proportion equation
   20,986.55 : 28,902.72 = 17,416.88 : x
2. Step 2: Convert to fraction form
   20,986.55/28,902.72 = 17,416.88/x
3. Step 3: Cross multiply
   20,986.55x = 28,902.72 × 17,416.88
4. Step 4: Simplify right side
   20,986.55x = 503,395,061.40
5. Step 5: Solve for x
   x = 503,395,061.40/20,986.55
6. Step 6: Final answer
   x = 23,986.56