Finding the Fourth Proportional to 12,923.40, 17,731.71 and 12,591.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,923.40 : 17,731.71 = 12,591.72 : x
2. Step 2: Convert to fraction form
   12,923.40/17,731.71 = 12,591.72/x
3. Step 3: Cross multiply
   12,923.40x = 17,731.71 × 12,591.72
4. Step 4: Simplify right side
   12,923.40x = 223,272,727.44
5. Step 5: Solve for x
   x = 223,272,727.44/12,923.40
6. Step 6: Final answer
   x = 17,276.62