Finding the Fourth Proportional to 57,719.61, 86,578.86 and 31,078.05

Step by Step Solution

1. Step 1: Write the proportion equation
   57,719.61 : 86,578.86 = 31,078.05 : x
2. Step 2: Convert to fraction form
   57,719.61/86,578.86 = 31,078.05/x
3. Step 3: Cross multiply
   57,719.61x = 86,578.86 × 31,078.05
4. Step 4: Simplify right side
   57,719.61x = 2,690,702,140.02
5. Step 5: Solve for x
   x = 2,690,702,140.02/57,719.61
6. Step 6: Final answer
   x = 46,616.78