Finding the Fourth Proportional to 57,081.86, 85,642.78 and 17,638.97

Step by Step Solution

1. Step 1: Write the proportion equation
   57,081.86 : 85,642.78 = 17,638.97 : x
2. Step 2: Convert to fraction form
   57,081.86/85,642.78 = 17,638.97/x
3. Step 3: Cross multiply
   57,081.86x = 85,642.78 × 17,638.97
4. Step 4: Simplify right side
   57,081.86x = 1,510,650,427.14
5. Step 5: Solve for x
   x = 1,510,650,427.14/57,081.86
6. Step 6: Final answer
   x = 26,464.63