Finding the Fourth Proportional to 19,355.50, 28,978.17 and 12,761.56

Step by Step Solution

1. Step 1: Write the proportion equation
   19,355.50 : 28,978.17 = 12,761.56 : x
2. Step 2: Convert to fraction form
   19,355.50/28,978.17 = 12,761.56/x
3. Step 3: Cross multiply
   19,355.50x = 28,978.17 × 12,761.56
4. Step 4: Simplify right side
   19,355.50x = 369,806,655.15
5. Step 5: Solve for x
   x = 369,806,655.15/19,355.50
6. Step 6: Final answer
   x = 19,106.02