Finding the Fourth Proportional to 12,926.88, 19,368.72 and 12,440.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,926.88 : 19,368.72 = 12,440.88 : x
2. Step 2: Convert to fraction form
   12,926.88/19,368.72 = 12,440.88/x
3. Step 3: Cross multiply
   12,926.88x = 19,368.72 × 12,440.88
4. Step 4: Simplify right side
   12,926.88x = 240,963,921.27
5. Step 5: Solve for x
   x = 240,963,921.27/12,926.88
6. Step 6: Final answer
   x = 18,640.53