Finding the Fourth Proportional to 20,766.27, 31,130.88 and 7,615.59

Step by Step Solution

1. Step 1: Write the proportion equation
   20,766.27 : 31,130.88 = 7,615.59 : x
2. Step 2: Convert to fraction form
   20,766.27/31,130.88 = 7,615.59/x
3. Step 3: Cross multiply
   20,766.27x = 31,130.88 × 7,615.59
4. Step 4: Simplify right side
   20,766.27x = 237,080,018.42
5. Step 5: Solve for x
   x = 237,080,018.42/20,766.27
6. Step 6: Final answer
   x = 11,416.59