Finding the Fourth Proportional to 22,928.09, 31,643.28 and 12,857.49

Step by Step Solution

1. Step 1: Write the proportion equation
   22,928.09 : 31,643.28 = 12,857.49 : x
2. Step 2: Convert to fraction form
   22,928.09/31,643.28 = 12,857.49/x
3. Step 3: Cross multiply
   22,928.09x = 31,643.28 × 12,857.49
4. Step 4: Simplify right side
   22,928.09x = 406,853,156.17
5. Step 5: Solve for x
   x = 406,853,156.17/22,928.09
6. Step 6: Final answer
   x = 17,744.75