Finding the Fourth Proportional to 71,856.18, 99,164.59 and 40,025.09

Step by Step Solution

1. Step 1: Write the proportion equation
   71,856.18 : 99,164.59 = 40,025.09 : x
2. Step 2: Convert to fraction form
   71,856.18/99,164.59 = 40,025.09/x
3. Step 3: Cross multiply
   71,856.18x = 99,164.59 × 40,025.09
4. Step 4: Simplify right side
   71,856.18x = 3,969,071,787.41
5. Step 5: Solve for x
   x = 3,969,071,787.41/71,856.18
6. Step 6: Final answer
   x = 55,236.33