Finding the Fourth Proportional to 28,556.98, 42,845.72 and 12,760.69

Step by Step Solution

1. Step 1: Write the proportion equation
   28,556.98 : 42,845.72 = 12,760.69 : x
2. Step 2: Convert to fraction form
   28,556.98/42,845.72 = 12,760.69/x
3. Step 3: Cross multiply
   28,556.98x = 42,845.72 × 12,760.69
4. Step 4: Simplify right side
   28,556.98x = 546,740,950.75
5. Step 5: Solve for x
   x = 546,740,950.75/28,556.98
6. Step 6: Final answer
   x = 19,145.62