Finding the Fourth Proportional to 57,684.14, 86,605.89 and 39,870.92

Step by Step Solution

1. Step 1: Write the proportion equation
   57,684.14 : 86,605.89 = 39,870.92 : x
2. Step 2: Convert to fraction form
   57,684.14/86,605.89 = 39,870.92/x
3. Step 3: Cross multiply
   57,684.14x = 86,605.89 × 39,870.92
4. Step 4: Simplify right side
   57,684.14x = 3,453,056,511.72
5. Step 5: Solve for x
   x = 3,453,056,511.72/57,684.14
6. Step 6: Final answer
   x = 59,861.45