Finding the Fourth Proportional to 28,554.62, 42,840.69 and 12,772.94

Step by Step Solution

1. Step 1: Write the proportion equation
   28,554.62 : 42,840.69 = 12,772.94 : x
2. Step 2: Convert to fraction form
   28,554.62/42,840.69 = 12,772.94/x
3. Step 3: Cross multiply
   28,554.62x = 42,840.69 × 12,772.94
4. Step 4: Simplify right side
   28,554.62x = 547,201,300.83
5. Step 5: Solve for x
   x = 547,201,300.83/28,554.62
6. Step 6: Final answer
   x = 19,163.32