Finding the Fourth Proportional to 71,817.69, 99,109.09 and 39,987.27

Step by Step Solution

1. Step 1: Write the proportion equation
   71,817.69 : 99,109.09 = 39,987.27 : x
2. Step 2: Convert to fraction form
   71,817.69/99,109.09 = 39,987.27/x
3. Step 3: Cross multiply
   71,817.69x = 99,109.09 × 39,987.27
4. Step 4: Simplify right side
   71,817.69x = 3,963,101,941.28
5. Step 5: Solve for x
   x = 3,963,101,941.28/71,817.69
6. Step 6: Final answer
   x = 55,182.81