Finding the Fourth Proportional to 65,182.72, 89,936.56 and 39,688.80

Step by Step Solution

1. Step 1: Write the proportion equation
   65,182.72 : 89,936.56 = 39,688.80 : x
2. Step 2: Convert to fraction form
   65,182.72/89,936.56 = 39,688.80/x
3. Step 3: Cross multiply
   65,182.72x = 89,936.56 × 39,688.80
4. Step 4: Simplify right side
   65,182.72x = 3,569,474,142.53
5. Step 5: Solve for x
   x = 3,569,474,142.53/65,182.72
6. Step 6: Final answer
   x = 54,761.05