Finding the Fourth Proportional to 20,892.56, 28,830.47 and 12,395.48

Step by Step Solution

1. Step 1: Write the proportion equation
   20,892.56 : 28,830.47 = 12,395.48 : x
2. Step 2: Convert to fraction form
   20,892.56/28,830.47 = 12,395.48/x
3. Step 3: Cross multiply
   20,892.56x = 28,830.47 × 12,395.48
4. Step 4: Simplify right side
   20,892.56x = 357,367,308.15
5. Step 5: Solve for x
   x = 357,367,308.15/20,892.56
6. Step 6: Final answer
   x = 17,105.01