Finding the Fourth Proportional to 85,856.76, 128,734.92 and 39,084.12

Step by Step Solution

1. Step 1: Write the proportion equation
   85,856.76 : 128,734.92 = 39,084.12 : x
2. Step 2: Convert to fraction form
   85,856.76/128,734.92 = 39,084.12/x
3. Step 3: Cross multiply
   85,856.76x = 128,734.92 × 39,084.12
4. Step 4: Simplify right side
   85,856.76x = 5,031,491,061.47
5. Step 5: Solve for x
   x = 5,031,491,061.47/85,856.76
6. Step 6: Final answer
   x = 58,603.32