Finding the Fourth Proportional to 21,685.94, 29,926.82 and 12,733.55

Step by Step Solution

1. Step 1: Write the proportion equation
   21,685.94 : 29,926.82 = 12,733.55 : x
2. Step 2: Convert to fraction form
   21,685.94/29,926.82 = 12,733.55/x
3. Step 3: Cross multiply
   21,685.94x = 29,926.82 × 12,733.55
4. Step 4: Simplify right side
   21,685.94x = 381,074,541.01
5. Step 5: Solve for x
   x = 381,074,541.01/21,685.94
6. Step 6: Final answer
   x = 17,572.43