Finding the Fourth Proportional to 71,685.86, 98,928.50 and 39,856.82

Step by Step Solution

1. Step 1: Write the proportion equation
   71,685.86 : 98,928.50 = 39,856.82 : x
2. Step 2: Convert to fraction form
   71,685.86/98,928.50 = 39,856.82/x
3. Step 3: Cross multiply
   71,685.86x = 98,928.50 × 39,856.82
4. Step 4: Simplify right side
   71,685.86x = 3,942,974,723.44
5. Step 5: Solve for x
   x = 3,942,974,723.44/71,685.86
6. Step 6: Final answer
   x = 55,003.53