Finding the Fourth Proportional to 19,344.84, 28,978.78 and 12,751

Step by Step Solution

1. Step 1: Write the proportion equation
   19,344.84 : 28,978.78 = 12,751 : x
2. Step 2: Convert to fraction form
   19,344.84/28,978.78 = 12,751/x
3. Step 3: Cross multiply
   19,344.84x = 28,978.78 × 12,751
4. Step 4: Simplify right side
   19,344.84x = 369,508,423.78
5. Step 5: Solve for x
   x = 369,508,423.78/19,344.84
6. Step 6: Final answer
   x = 19,101.14