Finding the Fourth Proportional to 22,415.50, 30,932.79 and 12,857.00

Step by Step Solution

1. Step 1: Write the proportion equation
   22,415.50 : 30,932.79 = 12,857.00 : x
2. Step 2: Convert to fraction form
   22,415.50/30,932.79 = 12,857.00/x
3. Step 3: Cross multiply
   22,415.50x = 30,932.79 × 12,857.00
4. Step 4: Simplify right side
   22,415.50x = 397,702,678.15
5. Step 5: Solve for x
   x = 397,702,678.15/22,415.50
6. Step 6: Final answer
   x = 17,742.31