Finding the Fourth Proportional to 57,891.78, 86,701.59 and 28,216.62

Step by Step Solution

1. Step 1: Write the proportion equation
   57,891.78 : 86,701.59 = 28,216.62 : x
2. Step 2: Convert to fraction form
   57,891.78/86,701.59 = 28,216.62/x
3. Step 3: Cross multiply
   57,891.78x = 86,701.59 × 28,216.62
4. Step 4: Simplify right side
   57,891.78x = 2,446,425,818.43
5. Step 5: Solve for x
   x = 2,446,425,818.43/57,891.78
6. Step 6: Final answer
   x = 42,258.60