Finding the Fourth Proportional to 57,856.79, 86,778.69 and 39,256.31

Step by Step Solution

1. Step 1: Write the proportion equation
   57,856.79 : 86,778.69 = 39,256.31 : x
2. Step 2: Convert to fraction form
   57,856.79/86,778.69 = 39,256.31/x
3. Step 3: Cross multiply
   57,856.79x = 86,778.69 × 39,256.31
4. Step 4: Simplify right side
   57,856.79x = 3,406,610,722.14
5. Step 5: Solve for x
   x = 3,406,610,722.14/57,856.79
6. Step 6: Final answer
   x = 58,880.06