Finding the Fourth Proportional to 81,456.15, 122,154.25 and 28,134.56

Step by Step Solution

1. Step 1: Write the proportion equation
   81,456.15 : 122,154.25 = 28,134.56 : x
2. Step 2: Convert to fraction form
   81,456.15/122,154.25 = 28,134.56/x
3. Step 3: Cross multiply
   81,456.15x = 122,154.25 × 28,134.56
4. Step 4: Simplify right side
   81,456.15x = 3,436,756,075.88
5. Step 5: Solve for x
   x = 3,436,756,075.88/81,456.15
6. Step 6: Final answer
   x = 42,191.49