Finding the Fourth Proportional to 22,756.95, 31,405.56 and 12,685.39

Step by Step Solution

1. Step 1: Write the proportion equation
   22,756.95 : 31,405.56 = 12,685.39 : x
2. Step 2: Convert to fraction form
   22,756.95/31,405.56 = 12,685.39/x
3. Step 3: Cross multiply
   22,756.95x = 31,405.56 × 12,685.39
4. Step 4: Simplify right side
   22,756.95x = 398,391,776.77
5. Step 5: Solve for x
   x = 398,391,776.77/22,756.95
6. Step 6: Final answer
   x = 17,506.38