Finding the Fourth Proportional to 28,081.35, 42,085.59 and 11,421.99

Step by Step Solution

1. Step 1: Write the proportion equation
   28,081.35 : 42,085.59 = 11,421.99 : x
2. Step 2: Convert to fraction form
   28,081.35/42,085.59 = 11,421.99/x
3. Step 3: Cross multiply
   28,081.35x = 42,085.59 × 11,421.99
4. Step 4: Simplify right side
   28,081.35x = 480,701,188.12
5. Step 5: Solve for x
   x = 480,701,188.12/28,081.35
6. Step 6: Final answer
   x = 17,118.17