Finding the Fourth Proportional to 28,084.69, 42,134.91 and 12,291.10

Step by Step Solution

1. Step 1: Write the proportion equation
   28,084.69 : 42,134.91 = 12,291.10 : x
2. Step 2: Convert to fraction form
   28,084.69/42,134.91 = 12,291.10/x
3. Step 3: Cross multiply
   28,084.69x = 42,134.91 × 12,291.10
4. Step 4: Simplify right side
   28,084.69x = 517,884,392.30
5. Step 5: Solve for x
   x = 517,884,392.30/28,084.69
6. Step 6: Final answer
   x = 18,440.10