Finding the Fourth Proportional to 28,081.67, 42,140.61 and 18,085.37

Step by Step Solution

1. Step 1: Write the proportion equation
   28,081.67 : 42,140.61 = 18,085.37 : x
2. Step 2: Convert to fraction form
   28,081.67/42,140.61 = 18,085.37/x
3. Step 3: Cross multiply
   28,081.67x = 42,140.61 × 18,085.37
4. Step 4: Simplify right side
   28,081.67x = 762,128,313.17
5. Step 5: Solve for x
   x = 762,128,313.17/28,081.67
6. Step 6: Final answer
   x = 27,139.71