Finding the Fourth Proportional to 28,078.82, 42,131.40 and 12,281.84

Step by Step Solution

1. Step 1: Write the proportion equation
   28,078.82 : 42,131.40 = 12,281.84 : x
2. Step 2: Convert to fraction form
   28,078.82/42,131.40 = 12,281.84/x
3. Step 3: Cross multiply
   28,078.82x = 42,131.40 × 12,281.84
4. Step 4: Simplify right side
   28,078.82x = 517,451,113.78
5. Step 5: Solve for x
   x = 517,451,113.78/28,078.82
6. Step 6: Final answer
   x = 18,428.52